Merge pull request #102 from ZappoMan/view_frustum_work

First Cut at View Frustum Culling between server and client
don't render agents that are not of type avatar
Merge pull request #103 from birarda/master

fix rendering of other agent types
include avatar ID on log output
Merge remote-tracking branch 'upstream/master'
view frustum additions means there are now 94 bytes per avatar
Merge pull request #104 from birarda/master

fix incorrect number of bytes per avatar
make other heads the same color and same size
Merge pull request #105 from birarda/master

fix the size of the heads of other avatars
Merge branch 'master' of https://github.com/worklist/hifi into view_frustum_work