Added floatNormal to FlxRandom (uses the box-muller transform algorithm for pseudorandom numbers arranged in a gaussian/normal distribution)
FlxSpriteGroup: if you turn out outlines in the debugger, drawDebug() fails on a null check because _point and _rect do not exist and are assumed to exist in FlxObject.drawDebug().
The overriden initVars() function in FlxSpriteGroup implies that these were excluded because they are not otherwise used, so I added a compiler conditional that only adds them if the debugger overlay is available.
Merge pull request #1250 from larsiusprime/fixbug_flxspritegroup_drawdebug

FlxSpriteGroup: if you turn out outlines in the debugger, drawDebug() fa...
FlxRandom: added floatNormal for random floats in a normal distribution (uses Box-Muller transform algorithm)
Merge branch 'dev' of http://www.github.com/HaxeFlixel/flixel into random_floatnormal
FlxRandom: Tweak to floatNormal()
FlxRandom: Fixes minor bug where incorrect values could be returned if user changes Mean and StDev on odd-numbered calls to floatNormal
FlxRandom: added link to normal distribution image (which goes live when the PR to demos is accepted)
Merge pull request #1251 from larsiusprime/random_floatnormal

FlxRandom: add floatNormal
Merge remote-tracking branch 'origin/dev' into dev