Fix type coercion bug with collisions

FlxGroup != FlxTypedGroup<FlxBasic> / just because something is a group, it does not mean it also has to extend FlxGroup
Make FlxTween.angle() and FlxTween.color() Sprite params optionals
Fix for issue #1010 (incorrect rendering for flipped sprites with FLX_RENDER_TILE flag)
Merge pull request #1017 from mrcdk/patch-1

Make FlxTween.angle() and FlxTween.color() Sprite params optionals
Made the FlxPoint / FlxVector / FlxRect constructors public again
FlxCallbackPoint fix
Remove pooling from FlxTimer and FlxPath

has same potential issues as tween pooling due to the fact that we allow storing a reference to the object
Update CHANGELOG.md
Update CHANGELOG.md