Merge Develop into Master?

[danoli3]

Nice time to Merge the branches with then changes so we can continue to develop for DK2.

I've also added the Pull request from @obviousjim 's latest changes into develop. Merge that first / test then merge into master ;)

What do you think @andreasmuller ?

[obviousjim]

I made a separate DK2 repo here: https://github.com/obviousjim/ofxOculusDK2 which is working but doesn't have head tracking integrated yet