Additional improvements to the bulk mesh upload: support more Collada! Specifically, this now supports something that the LL viewer doesn't: the ability for instances of geometries to reuse geometries specifications.
Imagine a track with many poles, each pole being the same geometry; the LL viewer requires a geometry element for every single pole! This patch makes libomv able to parse Collada files where instances reuse geometries, allowing for much more concise Collada files.
Deleting two extraneous fields from the llmesh header, rez_position and rez_scale. In talking to Dahlia, it turns out this was something she added to do something specific. She then gave this code to lkalif, who kept those 2 fields. They were harmless, but meaningless for the viewer.
One final improvement to instanced geometry in the libomv model: create only the necessary assets.
Merge pull request #15 from diva/master

Additional improvements to the bulk mesh upload: support more Collada!