HaxeFlixel/flixel — pull request #582 by SergioB (2013-08-12 17:50:27+00:00)
Title: Made FlxSlider and FlxTrail work with FlxSpriteGroup

The code is a little ugly (A lot of unused members have been added to FlxSpriteGroup) but it works without casts (so the speed of execution must be better)