Style fixes for presentation

Changed what the markers display on the maps of center_map and produce templates.  Both have appropriate links to google directions based on address field of appropriate model.  Both also have a link to the API page to show it's contents, due to time constraints.  Still need to build List/Detail views for regular JSON data for these two models.  Added more fields to stand serializer to be viewable for presentation.  Changed margins on registration form to fit page layout.