Working on fixing the PX extension
Linear elements with Curved solution is working. Moving on to curved elements.
Merge remote-tracking branch 'blake/OptiXModel' into PX

Conflicts:
	src/ElVis/Core/FindElement.cu
I just get segfaults now...
Fixed segfault when running with double precision.
Update PX to use new GlobaleFaceIdx to PlanarFaceIdx interface.
Merge pull request #8 from BlakeNelson/OptiXModel

Opti x model