Provide support for default priority and default issue type when creating JIRA tickets.

Also expose an auto-create button for filing JIRA tickets.

One known limitation: you must update the project name to update the default issue type.  I tried
a bunch of different JS approaches to do it, but figured the easier thing for now is just to require
2 saves.

Also expose the default priority/issue type on the create issue form too.

Bump setup.py version.