Merge pull request #27 from sideeffects/send_upstream

Merge changes from Houdini trunk. Notable changes:
Various fixes
bug fixes
bug fix in NodeManager
various fixes
GLFW 3 support and point partitioning improvements
Fixed a bug in Tree::ValueOffIter and added utility methods for point partitioning in Houdini.
Fixed a bug in Tree::ValueOffIter and added utility methods for point partitioning in Houdini.
Fixed a bug in Tree::ValueOffIter and added utility methods for point partitioning in Houdini.
Move PointIndexGrid tools into GU_VDBPointTools

Conflicts:

	openvdb_houdini/houdini/geometry.h
SESI_OPENVDB also might not have OPENVDB_HOUDINI_API
Override updateParmsFlags() in Morph Level Set