Merge trunk

* 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.

Show held message details in a modal window. Contributed by Abhilash Raj (LP: 1004049).

Fix broken translation string on the login page. Contributed by Pranjal Yadav.

Fix small bug moderator/owner forms on list members page. Contributed by Pranjal Yadav (LP: 1308219).

fixed a rendering bug on login page

fixed 1308219 and merged trunk

save fixtures to postorius package

merge trunk

added vcrpy to some tests

Fixes #1004049

Added credits for Abhilash's contribution to news.rst

* URLs now contains the list-id instead of the fqdn_listname. Contributed by Abhilash Raj (LP: 1201150). ...

* Added dev_requirements.txt for installation of development dependencies.

moved some tests to vcrpy

add django_nose as test requirement

Change fqdn_listname with RFC 2369 list-id in URLs

Fix wrong labels in metrics template. Contributed by Sumana Harihareswara (LP: 1409033).

Fix untranslatable template strings. Contributed by Sumana Harihareswara (LP: 1157947).

Fix adding the a list owner on list creation. Contributed by Aurélien Bompard (LP: 1175967).

Show error message in login view. Contributed by Aurélien Bompard.

making messages in user_subscription_preferences.html translatable

user_settings.html template spacing near braces

Bug # 1157947 fixes plus 2 more tiny fixes ...

login.html - Mozilla capitalization fix
  user_address_activation_sent.html - spelling fix

readying templates for translation, and 2 small other fixes ...

Bug # 1157947 fixes
  grammar fix in line 57 of summary.html
  spacing fix to template in settings.html

correcting labels for list metrics

translation in metrics template

additional template translation for bug 1157947

more template translation for bug 1157947

Bug # 1157947 prepping for translation

Fix bug #1175967: owners is not part of a list's settings