Move jira_client and project out of the initial_data and as separate kwargs.

Trying to reuse some of this code to create auto-filing JIRA tickets required me to move things around.

Not sure what the issuetype does currently as an initial form value given it's a POST value.  Trying
to get rid of the dependency of request object in that function.
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.