added more performance stats tracking to octree server
moved stopTrackingThread() to setIsShuttingDown() to reduce chance of object conflict
Merge branch 'master' of https://github.com/worklist/hifi into scaling_work
added thread counts to json stats
added --statusHost config option to allow us to specify the host name of the status page
formatting tweaks
Merge pull request #2525 from ZappoMan/scaling_work

Voxel/Particle Server Scaling Work
Merge branch 'master' of https://github.com/highfidelity/hifi