Refer to body balls parents, not joint parents.
Merge branch 'master' of https://github.com/worklist/hifi

Conflicts:
	interface/src/Avatar.cpp
Merge branch 'master' of https://github.com/worklist/hifi
Build fix, render body as balls if we don't have an avatar.
Merge branch 'master' of https://github.com/worklist/hifi
Set head bone rotation from head orientation.
Removed unused variables.
Use the head rotation to adjust the position, too.
Adjusted head base/top transforms.
Forgot to update the default pose position.
Merge branch 'master' of https://github.com/worklist/hifi
Rework rotation estimation bits to use quaternions.
Scratch that; need to do this in a branch.
Merge branch 'master' of https://github.com/worklist/hifi
Remove the bounce term; it causes fluctuations in velocity.
Merge pull request #496 from ey6es/master

Apply the head rotation to the head bones, show balls when no avatar voxel URL is set.