Applied latest Vector* improvements to current revision. Ok, that's the last one I promise :P

reworked Vector classes, no change in API, reordered methods, divide-by-zero prevention, removed use of .set() in methods for better performance

Because the gl.finish and the computeCentroids not being enable I though the r41 should include these fixes too, hope this doesn't mess up things.

Added offset and repeat properties to Texture. It'll be tricky to add support for this on CanvasRenderer but should be easy on WebGLRenderer.

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).

Added support for custom attribute buffers to be correctly split across large meshes (>65K vertices)