Mirror mode fix, particleBirds.js

This fixes mirror mode for most models. http://public.highfidelity.io/meshes/Mission_gal.fst still doesn't quite work since she has her own head. But the problem here is not with mirror mode, first person also doesn't work properly.

I can't test particleBirds.js until binary king fixes the scripts for windows, but it might work. If it doesn't, I will fix it.