Update createjs libraries to most recent version

Definitions update for easeljs v0.8, tweenjs v0.6, preloadjs v0.6 and soundjs v0.6.

There were many changes in this release, so I may have missed somethings. If someone else could give a look at this update as well, it would be nice.

Cheers!
DefinitelyTyped has a definition file for WebAudioAPI.
Please use here if possible.
https://github.com/borisyankov/DefinitelyTyped/blob/master/webaudioapi/waa.d.ts