Compass tweaks: better initial extents, scale extents to compensate for
anisotropy, converge more quickly on compass heading.
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge pull request #652 from ey6es/master

Improved compass fusion for gyros.
Merge pull request #655 from ZappoMan/occlusion_culling

Make Delta Sending Default, Added option for "Low Res" mode while moving