adding more changes and small improvements to camera, and head...
Got rid of AGENT_TYPE_HEAD and fixed voxel server to use AGENT_TYPE_INTERFACE
resolve merge conflicts with origin/master
Merge branch 'master' of https://github.com/worklist/hifi
add back voxels.render() call
fixed bug in avatar arm IK prototype
Ya Ya Too Cool Too Cool

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Merge branch 'master' of https://github.com/worklist/hifi
condensed avatar bone line code
added camera modes and also set initial avatar yaw to 90
removed glm::dvec3 and replaced with glm::vec3 in most of avatar code, except for velocity
add avatar mixer to agent type names, remove head
Merge remote-tracking branch 'upstream/master' into 19170B