updated .gitignore
fixed gitignore to ignore everything except models used for unit tests
adding test data
Added a group of stl files for models that could't be loaded by assimp
as a ply. Future versions of assimp will fix this bug.
Added script to convert models whenever necessary to work around issues
with assimp
fixed gitignore to keep cgdb in repo
Merge branch 'master' of github.com:CURG/object_models
fixed missing model database files