BackButton support for WP8
Added fake GamePad class
Implemented Game.Exit()
Merge branch 'orientation' of https://github.com/Nezz/MonoGame into wp8_backbutton_v2
Get BackPressed from page
Merge branch 'orientation' of https://github.com/Nezz/MonoGame into wp8_backbutton_V2
Updated template
Merge branch 'orientation' of https://github.com/Nezz/MonoGame into wp8_backbutton_V2
Merge branch 'orientation' of https://github.com/Nezz/MonoGame into wp8_backbutton_V2
Merge branch 'develop3d' of https://github.com/mono/MonoGame into wp8_backbutton_V2
Merge branch 'wp8_backbutton_V2' of https://github.com/Nezz/MonoGame into wp8_backbutton_v3
Merge branch 'develop' of https://github.com/mono/MonoGame into wp8_backbutton_v3
Merge pull request #1500 from Nezz/wp8_backbutton_v3

BackButton support for WP8 (resubmit)