Simple restructuring commit; nothing of value.
More restructuring.
First psuedo-functional commit.

Creates a very basic wrapper around the osgoit example. This code uses a
very silly method of subclassing osg::Group, which I think is
unnecessary. I can either use the childInserted/childRemoved virtuals to
do my proxy work or just simply create a new parent when switching to
DEPTH_PEELING mode.