Added Grunt.js

Included commonly used Grunt plugins including:
grunt-contrib-copy
grunt-contrib-jshint
grunt-contrib-uglify
grunt-contrib-watch
grunt-htmlhint
grunt-recess
Removed LESS.js from index.html

No need for it now that Grunt.js is compiling on the fly.
Prepare to merge grunt and master branches

Made it easier to choose to use Grunt.js to compile the JS and LESS, or
simply allow the use of the raw files without the need to compile. Also
added content to Readme.md file.
Updated Readme.md
Merge branch 'grunt'