Add requirements for tests
Expect the request to be AJAX

We don't have a return condition if it isn't AJAX
so for now just expect it. It would have blown up
either way, but at least now the code is simpler.
Expect stripe_token to be there

If stripe_token wasn't there it was going to blow
up on an undefined error for the `data` variable.
This way the code is simpler.
Remove unused context variables
Add some tests for some of the AJAX views