Merge pull request rtfpessoa#5 from rtfpessoa/support-diffy.org

initial diffy support

fix readme

update README with new usage parameters and examples

add jscs style checker

* follow jscs node js style guide
* better html template content insertion

clean the readme and template

 * update readme to follow npm library updates
 * remove need for jQuery in template

css fix to Y scrollbar and update to highlightjs 8.6

use github hightlight