Thanks to @toji for blog post and DDS utilities.

Fixes #2348

TODO: example textures for alpha formats (DXT3, DXT5).

Giving a chance to mobile :)

See #2349

Particles are rendered using drawArrays, so there is no need for indices or offsets.

Particle sorting not implemented for BufferGeometry, will need to check if this is possible to do efficiently.

See #2352

Work-in-progress, don't merge yet.

All examples should work now.

The only weird thing seems to be that for some reason bone texture doesn't like to be assigned to arbitrary texture unit (or more precisely to alternating texture units).

See #2340

As discussed in #2340

Do not merge yet, this is not finished.

webgl_geometry_subdivison.html -> webgl_geometry_subdivision.html

Uhm, some day it would be nice to rewrite all this Shape/Path/Curve/CurvePath code...