Fixed Celery link in "Emails with Celery".
Merge pull request #225 from nfvs/fix_emails_with_celery_link

Fixed Celery link in "Emails with Celery".
Fix `password_changed` signal to behave like the other signals. Fixes #222
Fix confirmation endpoint to flash an "already confirmed" message if user attempts to confirm after already being confirmed
Convert all tests to use pytest. Phew!
Update tox.ini and MANIFEST.in
Update gitignore
Add moar tests!
A bunch of adjustments to satisfy existing tests and even some new ones
Update build files
Remove duplicated line
Polish
Polish
Clean up tests with some pytest marking
Something about a bug...
Check `X-Forwarded-For` header value when tracking IP addresses. Fixes #234
Add mock X-Forwarded-For header in trackable tests
Polish for static analysis
Update CHANGES