Rave glove demo: network-glove fixes
After this change, people can see each other's rave glove performances.
1. Moved hand->simulate call into avatar->simulate so that it gets called on all avatars, not just mine.
2. Hide the rave stage, so it's out of the way while we figure out the best way to darken the world, if that's still desired.
Merge pull request #787 from machinelevel/dev4

Rave glove demo: network-glove fixes