Try using the head neck/eye rotation updates on the skeleton.
Better default scale, get eye positions from skeleton.
Merge branch 'master' of https://github.com/highfidelity/hifi
Better head heights for headless skeletons.
If "collide with avatars" is off, don't attempt camera pushback.
Merge pull request #2773 from ey6es/master

Fix for head/eye rotation on models without separate heads.