Make common_name a required field, add display_name property

display_name is will be used as the value to put into an autocomplete box
Changing boundaries autocomplete URL to match pattern used for species.
Remove filtering and default max_items from boundary view

Since the autocomplete which consumes this list will prefetch the entire
list, querying is not necessary.
Convert boundary dropdown into an typeahead.js autocomplete
Merge pull request #119 from maurizi/topic/boundaryTypeahead

Topic/boundary typeahead