Add missing requirements in Build.PL
Change ChadoData attributes to lazy_build
Add get_cv_name() and get_db_names()
Better accessors for ChadoData cvterms
Make OntologyTerm objects in ChadoData
Add extra getters to OntologyData
Rename test
Add OntologyData and restructure parser to use it

We now pass an OntologyData object to ParseOBO which then adds the new OBO
data.  This allows loading multiple OBO files into one OntologyData object.

Also added some OBO tests.