Passthrough classes

Added Pose, Quaternion and Vector3 pass-through classes. This means that when the user uses the simulator, every class will be prepended with myoSim:: (or the user will place a 'using namespace myoSim' line in the code) and there will be no classes referenced that are a part of the myo namespace. Now it is easy for the user to go back and forth between using the simulator and the actual device. All the user has to do is replace every myoSim:: with myo::, or vice versa, or replace 'using namespace myoSim' with 'using namespace myo'.