Blender Git Loki

Implemented caps for the convex hair bundle hulls.

The current algorithm generates a triangle strip to fill the end of
each child bundle. This is not quite ideal, because even though the
base child groups are constructed to be convex, the resulting child
paths can become concave again by clumping, roughness, hair dynamics
etc.. This can create face inversion as well as ugly shading artifacts,
so a nicer algorithm may be desirable.