FlxG.resetGame(): fix some variables not being reset to default
Update CHANGELOG.md
FlxGamepad: use arrays instead of maps, closes #971

not a good idea to iterate over maps every frame
Fixed gamepad support in Flash.
Adding warning about unnecessary memory allocations in FlxGamepad (flash target only).
Memory optimization during FlxGame.update.
Adding warnings about memory allocations due to iterating Map datatypes every frame.
Comment style fix.
Removed SfxFader and Fader

- fader tweens FlxG.sound.volume, a regular tween works just fine for that
- SfxFader tweens the  volume of FlxSounds, which already have fadeIn() and fadeOut() functions
FlxSound: small optimization for fadeIn() and fadeOut()