Need to be able to interpolate loops.  Getting good behavior some times but wierd behvaior

in others.  branching for now.
Problem in logic image committed to documentation

Even spacing algorithm allows for subdivision as well as simplification
Slightly slower in the subdivision case.  Will optimize later or leave as is
unless complaints arise.

Fixes #90

This allows less dependence on the underlying base mesh
density which ultimately, is what we want the artist to not have
to worry about at all.
documentation image for issue #90
Merge branch 'loop_subdivide'