[#20] Perform better matching of geometry in cache to primitive groups in reference object.
[#20] Remove unused regex code.
[#20] Don't strip namespaces from Alembic cache in order to match OBJ naming.
[#20] Don't raise error for mismatching geo as not possible to detect.

Both the alembic cache and obj may have non-relevant geo present.
[#20] Restrict number of merges to relevant geo count.
Merge pull request #21 from 4degrees/20_naming_issues

Fix #20: Naming issues