Working on alternate IK mode.
More work on integrating IK solution from Sixense.
Merge branch 'master' of https://github.com/highfidelity/hifi
Rotation bits for alternate IK.
Tabs -> spaces.
Add ability to anchor an overlay
Merge pull request #2863 from ey6es/master

Added alternate IK method for Hydras from code provided by Sixense.
Merge pull request #2864 from Atlante45/fix_jittery_overlays

Add ability to anchor an overlay
Merge branch 'master' of https://github.com/highfidelity/hifi into priority