Test password reset via email.

There're two minor problems here:
1. First you need to include djang.auth urls, see stackoverflow:
http://stackoverflow.com/questions/17503040/django-registration-url-cannot-be-resolved/23031029#23031029.

2. There's a incompatibility problem between django 1.5 and 1.6, one guy
has a pull request for django-registration but it's not merged yet, so
we should limit this project to django<1.6, see:
https://bitbucket.org/ubernostrum/django-registration/pull-request/75/auth_urlspy-edited-online-with-bitbucket/diff