Fix collada loader when examples are viewed through server.

The following examples where broken on mrdoob.github.com and when
viewed through a local python web server. file:// worked.

webgl_loader_collada.html
webgl_loader_collada_keyframe.html
webgl_loader_json_blender.html

Tweaked the cloth simulation example a little.

Fixed SceneUtils.cloneObject.

Updated r46 with some bugfixes found post release.

Beautified usage example.

Fixed mouse listeners on draggable cubes example, also reverted to pr…

…evious aesthetic (sorry @alteredq).

REVISION++

* Added support to texture.offset in CanvasRenderer
* Removed ShadowVolume, ShadowVolumeDynamicMaterial and LensFlare classes.
* Removed Stencil Shadows and LensFlare code out of WebGLRenderer
* Added 2.59 folder to Blender, and removed old ones.

REVISION++