Finished adding methods for the minimum required OpenGL used in the Oculus Rift.
Merge branch 'windows-beta' into linux-beta

Conflicts:
	Project Virtua Middleman/Project Virtua Middleman.vcxproj
	Project Virtua Middleman/Project Virtua Middleman.vcxproj.filters
	Test Project/main.cpp
	lib/pvd.lib
	lib/pvmmd.lib