Updated Sencha Touch 2 to latest sdk
Added Sencha Touch 2 git ignore rules

Ignoring folders that are not used when building the application, and assume that they have no other use.
Added new fav icons and themes to Sencha Touch 2
Added Win 8 app bar to  Sencha Touch 2

Windows 8 / Phone 8 apps have their "menu" buttons on the bottom of the page.
Added dynamic visibility to Win 8 app bar in Sencha Touch 2
Updated Sencha Touch 2 package configuration
Merge pull request #268 from matthewdunsdon/added-laf-themes-to-sencha-touch

Added platform themes to sencha touch
Updated Xamarin assets