Adding custom floating hand avatar

[Jeff]

When gestures are applied, the model is added through the hand.py module. Create a copy of hand.py, place that in the same folder as the vizconnect file, and change the line of code that adds the model in the __init__ method of the HandModel class to:

#Initialize base class
import vizfx
hand = vizfx.addAvatar(file,**kw)
viz.VizAvatar.__init__(self,hand.id)
viz.EventClass.__init__(self)