Fix the search on EmailAddress admin.

We cannot query a foreign key directly, but we need to
specify one field. Now we query the username
Fix logout on password change in Django 1.7+

Fixes #143.

For more information:
https://docs.djangoproject.com/en/1.7/topics/auth/default/#session-invalidation-on-password-change
Bumped version for next pre-release
Quote install to allow version specifiers
Set env in exclude to match exactly
Merge pull request #150 from PersonalGenomesOrg/fix-change-password-logout

Fix logout on password change in Django 1.7+
Style fix

[ci skip]
Merge pull request #145 from mattions/switching-to-username-filed-for-search

Fix the search on EmailAddress admin.