gyro look off by default
remove unused setHeadFromGyros() routine - confusing.
Merge pull request #489 from ey6es/master

Voxel URL sharing between avatars, tweak to rotation computations, fix for null replies.
Merge branch 'master' of https://github.com/worklist/hifi
Added render menu choice to switch between voxel and ball avatar rendering.
Merge pull request #490 from PhilipRosedale/master

Added render choice for balls versus voxel avatars
Refer to body balls parents, not joint parents.