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!
About the ``` getResult(...param: any[]): Object; ``` , not sure that is the better approach since that is saying you're getting an array with the parameters, but you get instead is either just one argument, or just 2 (not on an array).


What about overloading the method:

```getResult(raw?: boolean): Object;```
```getResult(value: string, rawResult?: boolean): Object;```