SfxFader::finish() needs to be public
Fix bug with FlxMouseButton::justPressed(), closes #574
MouseEventManager: Only fire callback if sprites are visible and exist
FlxKeyboard: Some cleanup
FlxSplash: Small improvement
Log.add() infinite recursion fix
Fix CircularMotion, CubicMotion and QuadMotion tweens
Fix documenation for FlxTween.quadMotion
Missing #if !FLX_NO_KEYBOARD conditionals
fix for issue #579 (stamping text on native targets)
Tweak debugger window color for better readability
Allow FlxSpriteGroup to have FxlSpriteGroups as elements.

 https://github.com/HaxeFlixel/flixel/issues/391
Refactoring - moved IFlxBasic to FlxBasic.hx and IFlxSprite to FlxSprite.hx
Update README.md
Use MOUSE_LEAVE event to fix middle and right click bug (fixes #422)
Merge pull request #580 from SergioB/dev

Allow FlxSpriteGroup to have FlxSpriteGroups as elements, closes #391
Fix FlxTrail and FlxSlider for the FlxSpriteGroup change, #580
introduce IFlxParticle interface
less casting for FlxTypedGroup
Couple of math methods