Basic changes.
Removed Face4 bits in src.
Face3ized common geometries.
Updated builds.
Face3ized more geometries.
Removed more Face3/Face4 checks.
Removed Face4 stuff from WebGLRenderer.
Swaped edge orientation... (abc,acd to abd,bcd)
Updated builds.
Removed Face4 out of other renderers.
Face3ized Qrcode.
JSONLoader optimisations.
Simplified geometry colors example.
Removed faceUvs stuff.
It was a hack for ro.me...
Removed Face4 related pages from docs.
Updated builds.
Removed more Face4 stuff.
Yet more Face4 removed. Also fixed VTKLoader.
Added support for default attribute values.

If attributes are used by a shader but not supplied in the data, default
values can be assigned.
When a shader is created, default values for "color", "uv" and "uv2" are
automatically created.
Code clean up.