Created a drawVector() call that will draw a vector in 3-space with axes for testing
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
null change
Merge remote-tracking branch 'upstream/master'
Added Utility function angleBetween() which returns the positive angle between any two 3D vectors.
improved comment of function
Fixes in merge.
Merge branch 'master' of https://github.com/worklist/hifi
Fixes per code review
Merge pull request #221 from PhilipRosedale/master

Added utility function for angleBetween() to help with audio attenuation and other code