Added js-beautifier; improved uglify task

* New Grunt tasks 'jsbeautifier:verify' and 'jsbeautifier:modify'
* Split uglify task into 'uglify:debug' and 'uglify:production'
Merge pull request #16 from boplish/add-jsbeautifier

Added js-beautifier; improved uglify task
Improved the Node.js bootstrap server

* '/' is now served from 'index.html' if it exists
* Updated README
Moved bootstrap server default args out of the run script
Merge pull request #17 from boplish/node-server-improvements

Node server improvements
Corrected README