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.
Merge pull request #684 from newtzgames/dev

Corrected issues with multi-touch support in buttons.
Fix typo in description of TO_DEG
little change for pixels setter in FlxSprite (just to be sure)
introduction of collision types enum for less usage of Std.is()