make sure VoxelServer and ParticleServer are in Agent interest list
added back use of nodeWithUUID() instead of sharedpointer
Merge pull request #2550 from birarda/master

fix for Agent interest list
Merge pull request #2555 from ZappoMan/backtotrylockanduuid

added back use of nodeWithUUID() instead of sharedpointer
Merge branch 'master' of https://github.com/highfidelity/hifi