Make it work with django 1.7#91

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tzachyrm wants to merge 7 commits intodjango-nonrel:masterfrom

Implisit-archived:master

Commits on Sep 21, 2014

creating wsgi app using the recommended way to fix support for django 1.7
Tzach Yarimi
committed
make model validations work with django the 1.7 new check system
Tzach Yarimi
committed

Commits on Feb 25, 2015

adding support for email attachments with content-id
Tzach Yarimi
committed

Commits on Apr 19, 2015

Applying devappserver2 changes from devappengine2 branch
Tzach Yarimi
committed

Commits on May 17, 2015

fixing bug where attachment filename is None
Tzach Yarimi
committed

Commits on Aug 4, 2015

allowing loading django from virtualenv
Tzach Yarimi
committed

Commits on Dec 13, 2015

using importlib instead of django.utils.importlib that was removed in 1.9
Tzach Yarimi
committed