Updating README with Jan Pieper's recommendations, also remove confusing and incorrect mkdir;git init steps
Adding legal header to osd/vertex.h
renaming verion to BETA_1_1
From now on, hbr assumes that its clients will provide the defition of a
mutex class with Lock / Unlock public functions.

- remove Mutex implementation from Hbr (and revert to original PRman code)
- provide a Mutex class stub in osd
- add some forward declarations in OsdMesh to limit some of the mutex spills
- #include <osd/mutex.h> where needed (little hackish until we can refactor
some of far better)
- remove ILM_BASE from some CMakeLists

Closes #48
Good catch - in practice this should be pretty hard to get into... but
better safe than sorry.

Closes #46
Remove IlmBase dependencies for now as we are not using any of the features.

Leaving cmake/FindIlmBase.cmake in case we need the API in the future.

Closes #36
Fix the dependency section of the Readme file.

Closes #49.
Update README.md
First pass at an hbr regression test :
- generate baseline data with the new hbr_baseline tool
- run the a regression of the current hbr code over the baseline data-set with hbr_regression

There is still some cleanup to do to generalize some of the "shape" code as our intermediate
obj-like file format is unfortunately entrenching itself (we should really be using RIB...)

There is also a fair amounto f copy/pasted stuff in the regression code that needs to be refactored

Closes #32
Changed deprecated GLenum names
Change container get methods (HbrMesh::GetVertices, etc) to take
output iterators instead of std::vector - eases prman integration
for cases where std::list makes more sense.

Block allocate face children array in common case (<= 4 children).

Other, minor consistency edits.
HbrFace::Unrefine() needs to work with new face allocation strategy.
Merge branch 'master' of github.com:PixarAnimationStudios/OpenSubdiv
Oops - need osd regression to add proper libraries even if we don't really use them yet.

Closes #55
OsdMesh refactoring. Added OsdElementArrayBuffer and OsdPtexCoordinatesTextureBuffer, which manage GL resources on behalf of OsdMesh.
forgot to add new files. sorry!
(not so great) Fix for the hard-wired hbr regression path to work
with Windows.

Closes #58
Merge branch 'master' of github.com:PixarAnimationStudios/OpenSubdiv
fix crash bug of mayaViewer with edgeCreases
Added new maya plugin example which uses MPxShaderOverride to display osdmesh.