Added utility method for path to repo folder.
Revert "Added utility method for path to repo folder."

This reverts commit 1e5fb526ca91d00e8127da533d7b596937aa5d4d.
Create CSV file of ontology classes.

For a given ontology, generates a CSV file of all the classes in the
ontology.  Only includes columns for standard properties.  Fixes
NCBO-371.
Unit test improvements.
Merge branch 'ncbo-371' into staging