Check the email against the email address, not the code

[larubbio]

When checking if a signup code exists the existing code was comparing the email address against the code

[jtauber]

We should write a regression test for this (although needn't block merging)

[larubbio]

Just an FYI, I'm working on adding REST apis for this module with django rest framework. I'm not sure if you want that submitted as a PR. I do have tests for this there and that is how I found the issue.

[larubbio]

I've added tests for the SignupCode exists method.

[ossanna16]

@larubbio Thank you for adding the tests! @jtauber Can this be merged?

[jtauber]

I'd like @brosner to approve and do the merge.

[ossanna16]

👍

[brosner]

Can the tests be updated to reflect the Pinax coding style guide? Thanks!

[larubbio]

If someone else has the time to update them feel free. I'm not actually using this package anymore and don't have time to research the pinax style guide and update the tests.