Fixed some minor stuff in FlxScreenGrab
Merge branch 'dev' of http://www.github.com/HaxeFlixel/flixel-addons into dev

Conflicts:
	flixel/addons/plugin/screengrab/FlxScreenGrab.hx
Working on transitions
Basically works. Now need to make it extensible.
More progress on the Transitions!
Basic transition implementation done -- two types, Fade and Tile
Added diagonal gradients to TransitionFade
Cleaned up FlxG.switchState transition a bit.
Transitions: removed "include", switched it to embedded assets. Switches timer variable to FlxTimer, adds FlxMath.bound check
Transitions: Refactored a bit to avoid hacks, renamed FlxTransitionState to FlxTransitionableState
Merge branch 'dev' of http://www.github.com/HaxeFlixel/flixel-addons into dev
Merge branch 'dev' into transitions
Transitions: more cleanup
Transitions: Fixed wrong IDestroyable interface, added Duration to TransitionData constructor
Transitions: A little more cleanup
Transitions: fixing visual artifact
Merge pull request #97 from larsiusprime/transitions

Transitions