Merge pull request #194 from ProG4mr/flixelNME

FlxPhysSprite and FlxPhysState small amends:
Merge remote-tracking branch 'origin/dev' into flixelNME
Merge remote-tracking branch 'origin/dev' into flixelNME
fix for issue #273
Merge remote-tracking branch 'origin/dev' into flixelNME
Merge remote-tracking branch 'origin/dev' into texture_atlas
Added missing button IDs for the Xbox controller
Merge pull request #274 from volvis/flixelNME

Added missing button IDs for the Xbox controller
Merge remote-tracking branch 'origin/flixelNME' into texture_atlas
some work on spritesheetframes