Updated FlxTrailsArea. Fixes most of the drawing issues of https://github.com/HaxeFlixel/flixel/issues/832
Fix neko/cpp crash
Style cleanup for FlxPreloader, move getDomain() into FlxStringUtil
Temporary fix for the preloader getting stuck in debug mode
FlxTween cleanup
Remove html tags from comments

(includes <code>, </code>, <br> and <br />)
FlxFrame: make FlxPoints (default, null)
Manually merge FlxTrailArea fixes by @MrCdk, closes #832