added FlxSound _onComplete callback

works only on flash and desktop targets
Made onComplete callback for FlxSound public
fix for PxBitmapont's loadPixelizer() on html5
Added FlxG.quickWatch() and renamed FlxString.formatHash() to FlxString.formatStringMap()
small fix for template
Merge pull request #421 from Gama11/dev_watch

Added FlxG.quickWatch() and renamed FlxString.formatHash() to FlxString....
Merge branch 'dev' of https://github.com/HaxeFlixel/engine into dev
loadFromSprite() for FlxSprite and animation support for FlxTrail
Oops. Forgot to remove traces
slightly better loadFromSprite. sorry for spamming