Sort HTTP Tester Message model by id so they'll naturally be displayed in the order they were added.
Branch: feature/httptester-update
When displaying the paginator controls using rapidsms's paginator template tag, always display the current page number in the range somewhere.
Branch: feature/httptester-update
Instead of using checkboxes to indicate clearing rather than setting messages, use separate submit buttons for a cleaner interface.
Branch: feature/httptester-update