major update to building schema, changes to unit model too, way to record changes to model objects, better unique tag management for units and buildings, adding in django messaging system for confirming successful site actions, major cleanup of building details page layout, contact info now shows up on building details, form to edit building details plus actions to handle POST changes (protected by login_required), resource pages added for bloomington and columbia, custom multiselectformfield adopted, scripts updated, page styling changes, schema migration scripts.