Merge pull request #49 from maxirosson/dev

Upgraded admob version
Merge pull request #50 from maxirosson/dev

Dev
Merge pull request #51 from maxirosson/dev

Date & Time picker improvements
Merge pull request #53 from maxirosson/dev

Selector improvements
Added roboelectric
Improved analytics tracking
Analytics tracking improvements
Added proguard config to remove logs on prod
Use cases execution improvements
Added xxhdpi density to android utils
Upgraded action bar sherlock & support library versions
About dialog improvements
Styles clean up
Fixed some warnings