Update README.md
Merge remote-tracking branch 'origin/master'
Merge pull request #671 from HaxeFlixel/master

Update readme
Fix for FlxSprite bug when x < 0

See description on http://haxeflixel.com/forum/general-discussion/flxsprite-bug-when-x-0-on-flash-target
Merge pull request #677 from sinnus/patch-1

Fix for FlxSprite bug when x < 0
Fixes to FlxPoint and FlxSpriteGroup.
Refactored sprite flickering functionality - a big thanks to ghost
Update FlxSpriteGroup.hx
Fixing issue with FlxSpriteGroup where FlxPoint properties didn't retain their values.
default values for region size (now it equals to image size)
fix for FlxAnimationController's addByIndicies() method
added addByStringIndicies() method for animation controller
fix for issue #682
some changes regarding renaming FlxSprite's clone() to loadFromSprite()
less calculations for FlxMath.roundDecimal()
replaced math.pow with just multiplication in flxmath.rounddecimal
Corrected issues with multi-touch support in buttons.
Removing bad inline candidates.
Removed unnecessary code.

Since I commented out the add listener, it makes sense to remove the
remove listener call too.
Add the option to, when recycling an object from a FlxTypedGroup, force the object to be the specified class and not a super class of that.