Fix API config name in unit tests after 3ab6098

removed django_nose ...

added django1.8 test env to tox.ini

replace django-social-auth with django-browserid

* add testing documentation ...

* add a sample mailman.cfg for testing

reduced number of vcr cassette files used in current tests

remove dpulicate fixtures dir

* Added tox configuration and new test setup ...

* Modified some existing tests to not break when run independently from the standalone project.
* Added a test for the list metrics page.