Merge PR #164 into new branch 'patch-164' - Update mouse wheel events

Merging PR #164

> I added :
> 
> - the mouse wheel events (Actor.js, Director.js) to the framework,
> - a demo about it,
> - some corrections on the build script (sceneCSS.js filename and version.compile.*.sh),
> - some comments.
> Have a nice day !