Upgrading Icon Pack to jQuery Mobile 1.4

* The 34 original icons from Icon Pack have been removed in favor of improved icons from Font Awesome
* Grunt has been added to allow for building CSS from SCSS
* Upgraded to Font Awesome 4.0.3, now includes 369 icons
* Icon font has been removed in favor of pure SVG solution
* PNG fallbacks have been exported from Photoshop and compressed with ImageOptim