Merge pull request #20 from siratama/master

added Sound.alternateExtensions property : SoundJS 0.5.2
Fix Fixed bug
Fixed clone() Method
Update Sound.hx
Fixed wrong (Boolean) type and added missing type on parameter with default value.
Merge pull request #21 from utibenkei/bugfix

Fixed bugs
Merge pull request #22 from jpsecher/master

Fixed wrong type and added missing type on parameter with default value
Merge branch 'patch-1' of https://github.com/Penry/CreateJS-Haxe
added localX, localY property