gfx3d alpha1 released

This alpha release is a non-embarrassing release after huge refactory, ready for the community to review and start commit it to the trunk. This release makes the following major changes:

fix the following bugs:

and the following optimization:

And there are still a long way to go:

Attached is the tar ball, just untar it in $DOJO/all/truck/dojox, gfx3d directory is created, and gfx/lighting.js is overwritten.