Update the test of the API. Now all test pass.
Improve the API. Add a optional param in the passedcourses view to enable the possibility of only check one course instead the whole list of registered courses.
Do the gravatar resizing in the browser instead of asking gravatar for specific sizes to avoid caching issues
Allow to use the user email in the From: header when sending messages from the contact form
Merge pull request #20 from jespino/feature-grappelli

Adding grappelli as admin interface and changing user foreign keys to wo...
Add autocompletion support in user model for grapelli
Some fixes related to grapelli
Don't delete students' submissions and reviews...

...when a peer review exercise is deleted. The data in the mongodb is not
removed in cascade when there are changes in the postgresql.
Adding db auth based authentication