Merging the AllOptix branch into the SCI origin
Added gcc and g++ as the default compiler for apple computers. Also, now OptiX and CUDA are found automatically if they are in the default location
Added automatic compute capability detection to the ElVis/Core/CMakeLists.txt
fixed the tinyxml namespace issue
Merge remote-tracking branch 'dillonl/master' into AllOptixDev

Conflicts:
	src/ElVis/Core/CMakeLists.txt
	src/ElVis/Core/OptiXBuffer.hpp
	src/ElVis/Core/Scene.cpp
	src/ElVis/Core/Scene.h
	src/ElVis/Core/VolumeRenderingModule.cpp
	src/ElVis/Extensions/JacobiExtension/JacobiExtensionElVisModel.cpp
	src/Externals/MacOptiX/lib64/liboptix.1.dylib
	src/Externals/MacOptiX/lib64/liboptix.3.0.1.dylib
	src/Externals/MacOptiX/lib64/liboptix.dylib
	src/Externals/MacOptiX/lib64/liboptixu.1.dylib
	src/Externals/MacOptiX/lib64/liboptixu.3.0.1.dylib
	src/Externals/MacOptiX/lib64/liboptixu.dylib
	src/FindOptiX.cmake
Fixed merge conflict.