Attributes were not in fact updated before.

Updated misc_sound example with same functionality.

Fixed examples that were using them.

Plus some more Loader changes:

- fixed diffuse color and opacity being skipped when diffuse texture is present in JSON
- more proper handling of Phong materials (now use ambient / diffuse / specular / shininess from JSON)
- added handling of wrap / offset / repeat parameters for all textures

Fixed broken multiple lights indices in new normal map shader and changed displacement scale and bias to saner values.

Fixed broken postprocessing and Earth examples (were not yet translated to use new normal map shader).

Removed old normal map shader with custom lights.

Not perfect solution but better than nothing.

I think setViewOffset is mostly useful for multiple monitors
synced across multiple machines but that's a hard demo to setup
so these demos show doing it locally with muliple canvases

Now it's possible to have antialiased stereo.

It seems lineWidth defaults are different in Chrome and Firefox.

Still there are some clearing artefacts in Firefox :/

Disabled ambient light in trackball Earth example (to get rid of clouds in unlit part of the globe).

Also added silly path camera example.