When we send data to the avatar mixer, send the tweaked head rotation.  Closes
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #2151 from ey6es/master

Fix for head rotation tweaking.