Compressing Spritefonts.
Removed unused nad misnamed processor.
Ouya pause button support

Ouya system button sends Keycode.Menu after a delay if no double tap or hold is detected. It also sends Keycode.Home just before the system menu is opened (but not on dev kit controllers): http://forums.ouya.tv/discussion/comment/6076/#Comment_6076
Fixed default.build target for Linux
Added methods to get all processors and importers
Add missing GameUpdateRequiredException reference.
Current Song dispose was throwing exception. Changed to handle disposing the Song object more gracefully.
Merge pull request #1592 from azchohfi/develop

Fix for iOS not calling OnOrientationChanged.
Merge pull request #1594 from zVolodymyr/develop

Added methods to get all processors and importers
Merge pull request #1585 from Aranda/ouya_menu_button

Ouya pause button support
Merge pull request #1577 from SickheadGames/FontProcessor

Compressing Spritefonts.
Merge pull request #1599 from CartBlanche/PSMSongFix

Current Song dispose was throwing exception, due to multiple disposes.
Merge pull request #1598 from CartBlanche/PSMProjectChanges

Add missing GameUpdateRequiredException reference.