made avatars appear to float above the ground
Merge remote-tracking branch 'upstream/master'
Merge pull request #403 from Ventrella/master

added effect of avatars floating above the ground with knees bent slightly
Merge branch 'master' of https://github.com/worklist/hifi
Added amplification of gyro rates when applying to head, for more sensitivity, and to allow easily looking to one side and another
Added display head mouse option (default off) and all camera modes follow head gyros the same way.