Fix compiler warnings on 32-bit platforms.
Fix compiler errors for OpenGL-ES.
Fix linker settings for Android.
Added forward declarations for template specializations for raw topology data.
Add a first pass of optimization in CUDA kernels

Conflicts:
	opensubdiv/osd/cudaKernel.cu
Introduces a kernel for NUM_ELEMENTS=4. It's faster and not buggy,
anymore.
Fix Cuda compile warning in osd/cudaKernel.cu
WIP limit stencils factory

todo:
- fix rotated tangents on patches
- add "end-caps" (bilinear or Gregory ?)
- add pure bilinear stencil mode
Fix window title for glStencilViewer code example
Merge pull request #350 from nathan-at-digitalfish/build_android

Fix build for Android