Merge pull request #6 from HaxeFlixel/dev

Dev
Create FlxTrailArea.hx

A alternative class for sprite trails. Based on drawing sprites on a bitmap area.
Updated AlphaFactor parameter description
Small update from suggestions by Gama11
Changed the blendMode comment
Merge pull request #745 from KeyMaster-/dev

Create FlxTrailArea.hx
Adding variables for color transform

Adds offset and multiplier values used in the bitmap color transform
Fixing some leftover stuff from editing
Updated some code from older version
Merge pull request #746 from KeyMaster-/dev

Update FlxTrailArea with ColorTransform values
FlxTrailArea: Fix classname, use FlxTypedGroup<FlxSprite> instead of FlxSpriteGroup, code cleanup and better docs
FlxTrailArea.add(): Slightly better docs
FlxTrailArea: Fix black background bug, add x and y to constructor
Readme improvements
FlxBitmapUtil.merge()
fixing merge() method, but it's still not working properly
fixed merge(), at least i think so
removed two unused vars
added couple checks more into FlxBitmapUtil.merge()
added few checks to FlxBitmapUtil.merge()