Remove globally declared "using" in all OSS non UnitTest header files.
Get rid of a forgotten "using" in FemRepresentation.h
Merge branch 'master' of git.assembla.com:OpenSurgSim into fix/NoUsingInHeaders

Conflicts:
	SurgSim/Blocks/MassSpringNDRepresentationUtils.h
	SurgSim/Collision/BoxCapsuleDcdContact.cpp
	SurgSim/Collision/BoxDoubleSidedPlaneDcdContact.cpp
	SurgSim/Collision/BoxPlaneDcdContact.cpp
	SurgSim/Collision/BoxSphereDcdContact.cpp
	SurgSim/Collision/CapsuleSphereDcdContact.cpp
	SurgSim/Collision/CollisionPair.cpp
	SurgSim/Collision/DefaultContactCalculation.cpp
	SurgSim/Collision/SphereDoubleSidedPlaneDcdContact.cpp
	SurgSim/Collision/SpherePlaneDcdContact.cpp
	SurgSim/Collision/SphereSphereDcdContact.cpp
	SurgSim/Physics/DcdCollision.h
	SurgSim/Physics/DeformableRepresentation.h
	SurgSim/Physics/FemElement3DTetrahedron.h
	SurgSim/Physics/FemRepresentation.h
	SurgSim/Physics/MassSpringRepresentation.cpp
	SurgSim/Physics/PhysicsManagerState.cpp
	SurgSim/Physics/Representation.cpp
	SurgSim/Physics/Representation.h
	SurgSim/Physics/RigidRepresentationBase.h
Merge branch 'fix/NoUsingInHeaders' into 'master'

Remove globally declared "using" from all non UnitTest header files

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/600403