Small collision optimizations.
Ternary operator style fixes on FlxObject and FlxQuadTree.
Made better use of resolveGroup() in FlxQuadTree.add
Indentation fix.
Made better use of resolveGroup() in FlxQuadTree.add pt 2
Merge pull request #1009 from gamedevsam/collision_optimizations

Small collision optimizations.
FlxQuadTree: small cleanup for destroy()
Update README.md
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
More flipping changes
Merge branch 'dev' of https://github.com/HaxeFlixel/flixel into dev
Update fix for platform-inconsistent flipping for flipping on both axes