* Add grunt-jscs and .jscsrc (lint trailing whitespaces and indentation length)
* Cleanup .jshintrc (use globals instead of deprecated predefs)
* Add Gruntfile.js and *.json linting to npm test
N.B. This does not lint the whole src/ directory during grunt test but
this should definitely be our goal. Please try to de-lint any js files
you touch during development using a texteditor that support linting
(Sublime Text 3 and SublimeLinter 3 with jshint/jscs plugins work great)
* Add babelify as dev dependency
* Add babelify transform to browserify build
* Enable es6 support for jshint
* Ignore minified js files in babel transform
