Bug 1023950 - Implement real state handling for mozApps and apply visual...

 - gaia-confirm now has a JS + DOM Event API (I updated the example)
 - mozApp states are now handled entirely by gaia-grid which means l10n changes (moved to shared) many additional tests and some nicer code (which depends on bug 1027458)
- visuals for app states
This method is likely throwing a warning because of your use of |return something| while the function is not really returning anything at the end. Let's split those on 2 lines (i know this is less pretty).