Blender 2.66

Blender 2.66 is out. Just copied the addon and updated the versions. Also updated the readme's Linux path as that has changed.

I tested exporter to work, but importer has some issues: some models give error, some just finish without errors but no models imported either. However, I think it is unrelated to this upgrade as I think I've never imported a model correctly (haven't tried too many times though as there has been no need).