Merge pull request #7 from BlakeNelson/OptiXModel

Remove all cuda/optix interop.
Merge pull request #8 from BlakeNelson/OptiXModel

Opti x model
Fixed exception reporting.
Removed commented code.
Saving for a merge
Added new methods to allow plugins to have some control over the Newton iteration for ray-curved face intersections.
Merge remote-tracking branch 'blake/FixExceptions' into PX

Conflicts:
	src/ElVis/Core/Scene.cpp
Merge remote-tracking branch 'blake/NewtonUpdates' into PX

Conflicts:
	src/ElVis/Core/VolumeRenderingOptiXModule.cu
Working on curved elements