created mlp app, added occurrence model and basic admin functionality
Updated mlp models and admin.
Added mlp occurrence fixture
Removed unused fields from mlp Occurrence Model, added ontologies
Updated mlp models and added fixture
Updated mlp models.py, admin.py and added fixture. Simplified the model by removing the institutional code field and renaming the primary key from objectid to id
Added collector to list filter in mlp admin.py
Updated mlp models, admin and mysite.ontologies to accommodate biology table. Created Biology as one-to-one with Occurrence, but in the future should consider refactoring Biology, Geology and Archaeology as subclasses of Occurrence.

Also made minor updates to drp.models
Bug fix on mlp.admin