diff --git a/captcha.js b/captcha.js
index 50e952b..2273517 100644
--- a/captcha.js
+++ b/captcha.js
@@ -1,73 +1,126 @@
-'use strict'
+'use strict';
 
-const Canvas = require('canvas')
-const crypto = require('crypto')
+const Canvas = require('canvas');
+const sha256 = require('js-sha256');
+
+function randomFromTo(a, b) {
+  return () => {
+    return Math.floor(Math.random() * (b - a)) + a
+  }
+}
+
+const randomTextColor = randomFromTo(0, 100);
+const randomBgColor = randomFromTo(101, 255);
+const random10t30 = randomFromTo(10, 30);
+const random2t6 = randomFromTo(2, 6);
+const random1t3 = randomFromTo(1, 3);
+const random0t3 = randomFromTo(0, 3);
+const random0t57 = randomFromTo(0, 57);
+
+// Removed o,O,0,I,l for simplicity for humans
+const chars = ['a','b','c','d','e','f','g','h','i','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z',
+  'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z',
+  '0','1','2','3','4','5','6','7','8','9',
+];
+
+const getRandomChar = () => {
+  return chars[random0t57()];
+};
 
 class Captcha {
-    constructor(params) {
-        params.cookie = params.cookie || 'captcha'
-        params.cryptoAlg = params.cryptoAlg || 'sha1'
-        params.cryptoPass = params.cryptoPass || crypto.randomBytes(32)
-        params.color = params.color || 'rgb(0,100,100)'
-        params.background = params.background || 'rgb(255,200,150)'
-        params.lineWidth = params.lineWidth || 8
-        params.fontSize = params.fontSize || 80
-        params.codeLength = params.codeLength || 6
-        params.canvasWidth = params.canvasWidth || 250
-        params.canvasHeight = params.canvasHeight || 150
-
-        this.params = params
-    }
+  constructor(params) {
+    params.cookie = params.cookie || 'captcha';
+    params.color = params.color || 'rgb(0,100,100)';
+    params.background = params.background || 'rgb(255,200,150)';
+    params.lineWidth = params.lineWidth || 6;
+    params.fontSize = params.fontSize || 70;
+    params.codeLength = params.codeLength || 6;
+    params.canvasHeight = params.canvasHeight || 120;
+
+    this.randomHeightInCanvas = randomFromTo(0, params.canvasHeight);
+
+    this.params = params
+  }
+
+  randomHeightInCanvas() {}
+  randomWidthInCanvas() {}
+
+  image() {
+    return (req, res, next) => {
+      const codeLength = this.params.codeLength + random0t3();
+      this.params.canvasWidth = 40 * codeLength;
+      this.randomWidthInCanvas = randomFromTo(0, this.params.canvasWidth);
+      const canvas = new Canvas(this.params.canvasWidth, this.params.canvasHeight);
+      const ctx = canvas.getContext('2d');
+
+      ctx.antialias = 'gray';
+      ctx.fillStyle = `rgb(${randomBgColor()},${randomBgColor()},${randomBgColor()})`;
+      ctx.fillRect(0, 0, this.params.canvasWidth, this.params.canvasHeight);
+      ctx.strokeStyle = this.params.color;
+      ctx.font = `${this.params.fontSize }px sans`;
+
+      // draw text:
+      // draw two curve lines:
+      for (let i = 0; i < 6; i++) {
+        ctx.strokeStyle = `rgb(${randomTextColor()},${randomTextColor()},${randomTextColor()})`;
+        ctx.beginPath();
+        ctx.lineWidth = random2t6();
+        ctx.moveTo(Math.floor(0.08 * this.params.canvasWidth), Math.random() * this.params.canvasHeight);
+        ctx.bezierCurveTo(Math.floor(0.32 * this.params.canvasWidth), Math.random() * this.params.canvasHeight, Math.floor(1.07 * this.params.canvasHeight), Math.random() * this.params.canvasHeight, Math.floor(0.92 * this.params.canvasWidth), Math.random() * this.params.canvasHeight)
+        ctx.stroke();
+      }
+
+      for (let i = 0; i < 20; i++) {
+        ctx.strokeStyle = `rgb(${randomTextColor()},${randomTextColor()},${randomTextColor()})`;
+        ctx.beginPath();
+        ctx.lineWidth = random1t3();
+        ctx.arc(this.randomWidthInCanvas(), this.randomHeightInCanvas(), random10t30(), 0, 2 * Math.PI);
+        ctx.stroke();
+      }
+
+      for (let i = 0; i < 30; i++) {
+        ctx.strokeStyle = `rgb(${randomTextColor()},${randomTextColor()},${randomTextColor()})`;
+        ctx.beginPath();
+        ctx.lineWidth = random1t3();
+        ctx.rect(this.randomWidthInCanvas(), this.randomHeightInCanvas(), random10t30(), random10t30());
+        ctx.stroke();
+      }
+
+      let text = '';
+      for (let i = 0; i < codeLength; i++) {
+        const char = getRandomChar();
+        text += char;
+        ctx.fillStyle = `rgb(${randomTextColor()},${randomTextColor()},${randomTextColor()})`;
+        ctx.setTransform(Math.random() * 0.5 + 1, Math.random() * 0.4, Math.random() * 0.4, Math.random() * 0.5 + 1, Math.floor(0.375 * this.params.fontSize) * i + Math.floor(0.25 * this.params.fontSize), Math.floor(1.25 * this.params.fontSize));
+        ctx.fillText(char, 0, 0);
+      }
+
+      // save text:
+      if (req.session === undefined) {
+        throw Error('node-captcha requires express-session!')
+      }
+      req.session[this.params.cookie] = text.toLowerCase();
 
-    image() {
-        return (req, res, next) => {
-            const canvas = new Canvas(this.params.canvasWidth, this.params.canvasHeight)
-            const ctx = canvas.getContext('2d')
-
-            ctx.antialias = 'gray'
-            ctx.fillStyle = this.params.background
-            ctx.fillRect(0, 0, this.params.canvasWidth, this.params.canvasHeight)
-            ctx.fillStyle = this.params.color
-            ctx.lineWidth = this.params.lineWidth
-            ctx.strokeStyle = this.params.color
-            ctx.font = `${this.params.fontSize }px sans`
-
-            // draw two curve lines:
-            for (var i = 0; i < 2; i++) {
-                ctx.moveTo(Math.floor(0.08 * this.params.canvasWidth), Math.random() * this.params.canvasHeight)
-                ctx.bezierCurveTo(Math.floor(0.32 * this.params.canvasWidth), Math.random() * this.params.canvasHeight, Math.floor(1.07 * this.params.canvasHeight), Math.random() * this.params.canvasHeight, Math.floor(0.92 * this.params.canvasWidth), Math.random() * this.params.canvasHeight)
-                ctx.stroke()
-            }
-
-            // draw text:
-            const text = ('' + crypto.randomBytes(4).readUIntBE(0, 4)).substr(2, this.params.codeLength)
-            text.split('').forEach((char, i) => {
-                ctx.setTransform(Math.random() * 0.5 + 1, Math.random() * 0.4, Math.random() * 0.4, Math.random() * 0.5 + 1, Math.floor(0.375 * this.params.fontSize) * i + Math.floor(0.25 * this.params.fontSize), Math.floor(1.25 * this.params.fontSize))
-                ctx.fillText(char, 0, 0)
-            })
-
-            // save text:
-            if (req.session === undefined) {
-                throw Error('node-captcha requires express-session!')
-            }
-            req.session[this.params.cookie] = text
-
-            // send image:
-            res.type('jpg')
-            res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0')
-            res.header('Expires', 'Sun, 19 May 1984 02:00:00 GMT')
-            canvas.jpegStream().pipe(res)
-        }
+      // send image:
+      if (typeof res.type !== 'undefined') {
+        res.type('jpg');
+      } else {
+        res.setHeader('content-type', 'image/jpeg')
+      }
+      res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0');
+      res.header('Expires', 'Sun, 19 May 1984 02:00:00 GMT');
+      canvas.jpegStream().pipe(res)
     }
+  }
 
-    check(req, text) {
-        if (req.session === undefined) {
-            throw Error('node-captcha requires express-session!')
-        }
-        const res = req.session[this.params.cookie] === text
-        req.session[this.params.cookie] = null
-        return res
+  check(req, text) {
+    if (req.session === undefined) {
+      throw Error('node-captcha requires express-session!')
     }
+    const res = req.session[this.params.cookie] === text.toLowerCase();
+    req.session[this.params.cookie] = null;
+    return res
+  }
 }
 
-module.exports.create = params => new Captcha(params)
+module.exports.create = params => new Captcha(params);
diff --git a/package.json b/package.json
index 1e054a1..4ea728f 100644
--- a/package.json
+++ b/package.json
@@ -1,15 +1,16 @@
 {
-  "name": "captcha",
-  "description": "Simple captcha middleware for Express",
-  "version": "0.1.3",
+  "name": "@visualead/captcha",
+  "description": "Simple captcha middleware for Express or Restify",
+  "version": "2.0.0",
   "author": "napa3um <napa3um@gmail.com>",
   "dependencies": {
-    "canvas": "^1.6.5"
+    "canvas": "^1.6.5",
+    "js-sha256": "^0.6.0"
   },
   "main": "./captcha.js",
   "repository": {
     "type": "git",
-    "url": "git@github.com:napa3um/node-captcha.git"
+    "url": "git@github.com:Visualead/node-captcha.git"
   },
   "license": "MIT",
   "readmeFilename": "Readme.md",
diff --git a/test-server.js b/test-server.js
index 6f1ea35..e2e59aa 100644
--- a/test-server.js
+++ b/test-server.js
@@ -39,5 +39,5 @@ app.post('/login', (req, res) => {
 })
 
 app.listen(8080, () => {
-    console.log('server started')
+    console.log('server started at http://localhost:8080')
 })
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..2d9a742
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,393 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+accepts@~1.3.3:
+  version "1.3.3"
+  resolved "https://registry.yarnpkg.com/accepts/-/accepts-1.3.3.tgz#c3ca7434938648c3e0d9c1e328dd68b622c284ca"
+  dependencies:
+    mime-types "~2.1.11"
+    negotiator "0.6.1"
+
+array-flatten@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
+
+body-parser@^1.17.1:
+  version "1.17.2"
+  resolved "https://registry.yarnpkg.com/body-parser/-/body-parser-1.17.2.tgz#f8892abc8f9e627d42aedafbca66bf5ab99104ee"
+  dependencies:
+    bytes "2.4.0"
+    content-type "~1.0.2"
+    debug "2.6.7"
+    depd "~1.1.0"
+    http-errors "~1.6.1"
+    iconv-lite "0.4.15"
+    on-finished "~2.3.0"
+    qs "6.4.0"
+    raw-body "~2.2.0"
+    type-is "~1.6.15"
+
+bytes@2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/bytes/-/bytes-2.4.0.tgz#7d97196f9d5baf7f6935e25985549edd2a6c2339"
+
+canvas@^1.6.5:
+  version "1.6.5"
+  resolved "https://registry.yarnpkg.com/canvas/-/canvas-1.6.5.tgz#557f9988f5d2c95fdc247c61a5ee43de52f6717c"
+  dependencies:
+    nan "^2.4.0"
+    parse-css-font "^2.0.2"
+    units-css "^0.4.0"
+
+content-disposition@0.5.2:
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.2.tgz#0cf68bb9ddf5f2be7961c3a85178cb85dba78cb4"
+
+content-type@~1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/content-type/-/content-type-1.0.2.tgz#b7d113aee7a8dd27bd21133c4dc2529df1721eed"
+
+cookie-signature@1.0.6:
+  version "1.0.6"
+  resolved "https://registry.yarnpkg.com/cookie-signature/-/cookie-signature-1.0.6.tgz#e303a882b342cc3ee8ca513a79999734dab3ae2c"
+
+cookie@0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/cookie/-/cookie-0.3.1.tgz#e7e0a1f9ef43b4c8ba925c5c5a96e806d16873bb"
+
+crc@3.4.4:
+  version "3.4.4"
+  resolved "https://registry.yarnpkg.com/crc/-/crc-3.4.4.tgz#9da1e980e3bd44fc5c93bf5ab3da3378d85e466b"
+
+css-font-size-keywords@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/css-font-size-keywords/-/css-font-size-keywords-1.0.0.tgz#854875ace9aca6a8d2ee0d345a44aae9bb6db6cb"
+
+css-font-stretch-keywords@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/css-font-stretch-keywords/-/css-font-stretch-keywords-1.0.1.tgz#50cee9b9ba031fb5c952d4723139f1e107b54b10"
+
+css-font-style-keywords@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/css-font-style-keywords/-/css-font-style-keywords-1.0.1.tgz#5c3532813f63b4a1de954d13cea86ab4333409e4"
+
+css-font-weight-keywords@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/css-font-weight-keywords/-/css-font-weight-keywords-1.0.0.tgz#9bc04671ac85bc724b574ef5d3ac96b0d604fd97"
+
+css-global-keywords@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/css-global-keywords/-/css-global-keywords-1.0.1.tgz#72a9aea72796d019b1d2a3252de4e5aaa37e4a69"
+
+css-list-helpers@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/css-list-helpers/-/css-list-helpers-1.0.1.tgz#fff57192202db83240c41686f919e449a7024f7d"
+  dependencies:
+    tcomb "^2.5.0"
+
+css-system-font-keywords@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/css-system-font-keywords/-/css-system-font-keywords-1.0.0.tgz#85c6f086aba4eb32c571a3086affc434b84823ed"
+
+debug@2.6.7:
+  version "2.6.7"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.7.tgz#92bad1f6d05bbb6bba22cca88bcd0ec894c2861e"
+  dependencies:
+    ms "2.0.0"
+
+depd@1.1.0, depd@~1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.0.tgz#e1bd82c6aab6ced965b97b88b17ed3e528ca18c3"
+
+destroy@~1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/destroy/-/destroy-1.0.4.tgz#978857442c44749e4206613e37946205826abd80"
+
+ee-first@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/ee-first/-/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
+
+encodeurl@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.1.tgz#79e3d58655346909fe6f0f45a5de68103b294d20"
+
+escape-html@~1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/escape-html/-/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
+
+etag@~1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.0.tgz#6f631aef336d6c46362b51764044ce216be3c051"
+
+express-session@^1.15.2:
+  version "1.15.3"
+  resolved "https://registry.yarnpkg.com/express-session/-/express-session-1.15.3.tgz#db545f0435a7b1b228ae02da8197f65141735c67"
+  dependencies:
+    cookie "0.3.1"
+    cookie-signature "1.0.6"
+    crc "3.4.4"
+    debug "2.6.7"
+    depd "~1.1.0"
+    on-headers "~1.0.1"
+    parseurl "~1.3.1"
+    uid-safe "~2.1.4"
+    utils-merge "1.0.0"
+
+express@^4.15.2:
+  version "4.15.3"
+  resolved "https://registry.yarnpkg.com/express/-/express-4.15.3.tgz#bab65d0f03aa80c358408972fc700f916944b662"
+  dependencies:
+    accepts "~1.3.3"
+    array-flatten "1.1.1"
+    content-disposition "0.5.2"
+    content-type "~1.0.2"
+    cookie "0.3.1"
+    cookie-signature "1.0.6"
+    debug "2.6.7"
+    depd "~1.1.0"
+    encodeurl "~1.0.1"
+    escape-html "~1.0.3"
+    etag "~1.8.0"
+    finalhandler "~1.0.3"
+    fresh "0.5.0"
+    merge-descriptors "1.0.1"
+    methods "~1.1.2"
+    on-finished "~2.3.0"
+    parseurl "~1.3.1"
+    path-to-regexp "0.1.7"
+    proxy-addr "~1.1.4"
+    qs "6.4.0"
+    range-parser "~1.2.0"
+    send "0.15.3"
+    serve-static "1.12.3"
+    setprototypeof "1.0.3"
+    statuses "~1.3.1"
+    type-is "~1.6.15"
+    utils-merge "1.0.0"
+    vary "~1.1.1"
+
+finalhandler@~1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/finalhandler/-/finalhandler-1.0.3.tgz#ef47e77950e999780e86022a560e3217e0d0cc89"
+  dependencies:
+    debug "2.6.7"
+    encodeurl "~1.0.1"
+    escape-html "~1.0.3"
+    on-finished "~2.3.0"
+    parseurl "~1.3.1"
+    statuses "~1.3.1"
+    unpipe "~1.0.0"
+
+forwarded@~0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/forwarded/-/forwarded-0.1.0.tgz#19ef9874c4ae1c297bcf078fde63a09b66a84363"
+
+fresh@0.5.0:
+  version "0.5.0"
+  resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.0.tgz#f474ca5e6a9246d6fd8e0953cfa9b9c805afa78e"
+
+http-errors@~1.6.1:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/http-errors/-/http-errors-1.6.1.tgz#5f8b8ed98aca545656bf572997387f904a722257"
+  dependencies:
+    depd "1.1.0"
+    inherits "2.0.3"
+    setprototypeof "1.0.3"
+    statuses ">= 1.3.1 < 2"
+
+iconv-lite@0.4.15:
+  version "0.4.15"
+  resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.15.tgz#fe265a218ac6a57cfe854927e9d04c19825eddeb"
+
+inherits@2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
+ipaddr.js@1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.3.0.tgz#1e03a52fdad83a8bbb2b25cbf4998b4cffcd3dec"
+
+isnumeric@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/isnumeric/-/isnumeric-0.2.0.tgz#a2347ba360de19e33d0ffd590fddf7755cbf2e64"
+
+js-sha256@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/js-sha256/-/js-sha256-0.6.0.tgz#7fc3693526c53d39db9daaf63537ed38416aba96"
+
+media-typer@0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
+
+merge-descriptors@1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
+
+methods@~1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
+
+mime-db@~1.27.0:
+  version "1.27.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.27.0.tgz#820f572296bbd20ec25ed55e5b5de869e5436eb1"
+
+mime-types@~2.1.11, mime-types@~2.1.15:
+  version "2.1.15"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.15.tgz#a4ebf5064094569237b8cf70046776d09fc92aed"
+  dependencies:
+    mime-db "~1.27.0"
+
+mime@1.3.4:
+  version "1.3.4"
+  resolved "https://registry.yarnpkg.com/mime/-/mime-1.3.4.tgz#115f9e3b6b3daf2959983cb38f149a2d40eb5d53"
+
+ms@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
+
+nan@^2.4.0:
+  version "2.6.2"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.6.2.tgz#e4ff34e6c95fdfb5aecc08de6596f43605a7db45"
+
+negotiator@0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
+
+on-finished@~2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/on-finished/-/on-finished-2.3.0.tgz#20f1336481b083cd75337992a16971aa2d906947"
+  dependencies:
+    ee-first "1.1.1"
+
+on-headers@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/on-headers/-/on-headers-1.0.1.tgz#928f5d0f470d49342651ea6794b0857c100693f7"
+
+parse-css-font@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/parse-css-font/-/parse-css-font-2.0.2.tgz#7b60b060705a25a9b90b7f0ed493e5823248a652"
+  dependencies:
+    css-font-size-keywords "^1.0.0"
+    css-font-stretch-keywords "^1.0.1"
+    css-font-style-keywords "^1.0.1"
+    css-font-weight-keywords "^1.0.0"
+    css-global-keywords "^1.0.1"
+    css-list-helpers "^1.0.1"
+    css-system-font-keywords "^1.0.0"
+    tcomb "^2.5.0"
+    unquote "^1.1.0"
+
+parseurl@~1.3.1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/parseurl/-/parseurl-1.3.1.tgz#c8ab8c9223ba34888aa64a297b28853bec18da56"
+
+path-to-regexp@0.1.7:
+  version "0.1.7"
+  resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
+
+proxy-addr@~1.1.4:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-1.1.4.tgz#27e545f6960a44a627d9b44467e35c1b6b4ce2f3"
+  dependencies:
+    forwarded "~0.1.0"
+    ipaddr.js "1.3.0"
+
+qs@6.4.0:
+  version "6.4.0"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-6.4.0.tgz#13e26d28ad6b0ffaa91312cd3bf708ed351e7233"
+
+random-bytes@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/random-bytes/-/random-bytes-1.0.0.tgz#4f68a1dc0ae58bd3fb95848c30324db75d64360b"
+
+range-parser@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
+
+raw-body@~2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.2.0.tgz#994976cf6a5096a41162840492f0bdc5d6e7fb96"
+  dependencies:
+    bytes "2.4.0"
+    iconv-lite "0.4.15"
+    unpipe "1.0.0"
+
+send@0.15.3:
+  version "0.15.3"
+  resolved "https://registry.yarnpkg.com/send/-/send-0.15.3.tgz#5013f9f99023df50d1bd9892c19e3defd1d53309"
+  dependencies:
+    debug "2.6.7"
+    depd "~1.1.0"
+    destroy "~1.0.4"
+    encodeurl "~1.0.1"
+    escape-html "~1.0.3"
+    etag "~1.8.0"
+    fresh "0.5.0"
+    http-errors "~1.6.1"
+    mime "1.3.4"
+    ms "2.0.0"
+    on-finished "~2.3.0"
+    range-parser "~1.2.0"
+    statuses "~1.3.1"
+
+serve-static@1.12.3:
+  version "1.12.3"
+  resolved "https://registry.yarnpkg.com/serve-static/-/serve-static-1.12.3.tgz#9f4ba19e2f3030c547f8af99107838ec38d5b1e2"
+  dependencies:
+    encodeurl "~1.0.1"
+    escape-html "~1.0.3"
+    parseurl "~1.3.1"
+    send "0.15.3"
+
+setprototypeof@1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.0.3.tgz#66567e37043eeb4f04d91bd658c0cbefb55b8e04"
+
+"statuses@>= 1.3.1 < 2", statuses@~1.3.1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.3.1.tgz#faf51b9eb74aaef3b3acf4ad5f61abf24cb7b93e"
+
+tcomb@^2.5.0:
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-2.7.0.tgz#10d62958041669a5d53567b9a4ee8cde22b1c2b0"
+
+type-is@~1.6.15:
+  version "1.6.15"
+  resolved "https://registry.yarnpkg.com/type-is/-/type-is-1.6.15.tgz#cab10fb4909e441c82842eafe1ad646c81804410"
+  dependencies:
+    media-typer "0.3.0"
+    mime-types "~2.1.15"
+
+uid-safe@~2.1.4:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/uid-safe/-/uid-safe-2.1.4.tgz#3ad6f38368c6d4c8c75ec17623fb79aa1d071d81"
+  dependencies:
+    random-bytes "~1.0.0"
+
+units-css@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/units-css/-/units-css-0.4.0.tgz#d6228653a51983d7c16ff28f8b9dc3b1ffed3a07"
+  dependencies:
+    isnumeric "^0.2.0"
+    viewport-dimensions "^0.2.0"
+
+unpipe@1.0.0, unpipe@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
+
+unquote@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/unquote/-/unquote-1.1.0.tgz#98e1fc608b6b854c75afb1b95afc099ba69d942f"
+
+utils-merge@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.0.tgz#0294fb922bb9375153541c4f7096231f287c8af8"
+
+vary@~1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.1.tgz#67535ebb694c1d52257457984665323f587e8d37"
+
+viewport-dimensions@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/viewport-dimensions/-/viewport-dimensions-0.2.0.tgz#de740747db5387fd1725f5175e91bac76afdf36c"