Squashed commits:
[c6cbd24] Remove fuzzy translation
[fd0ec11] Add newsletter app
Squashed commits:
[219ef97] Add newsletter from to settings
[00a2804] Add newsletter app
Squashed commits:
[dc13774[ Fix translations
[26f3bea] Prevent mass deletion from admin and fix add form
[2024827] Rename newsletter_optout to receive_newsletter
[baeb801] Squash migrations
[a8b50e7] Tests for email sending
[1d1f0b1] Move object creation and login to setUp
[3d0fda1] Add tests for newsletters that were not sent
[32e4196] Add more and fix tests
[82e5e6f] Thalia headers on the send page
[0d3b9ad] Send newsletter directly to user in BCC instead of using the mailman list
[8855730] Start writing tests
[8007c19] Add check in model for start and end times
[fbcd91c] Add rendering and sending email code
[507e932] Fix PEP styles
[1432cf0] Use main partner from the partners module
[31708d9] Add newsletter images to static
[299a873] Make frontend preview for newsletter
[e01e3d9] Change end date text
[c5661ba] Make newsletters multilingual
[4dc2579] Add help texts to newsletter fields
[337cf5e] Add introduction field to admin form
[262629b] Add introduction textfield to newsletter
[5a46afd] Re-add CASCADE on delete
[3270015] Add newsletter migrations
[bdb5b96] Add admin for newsletter models
[a613072] Finish models
[2e8946f] Add base files

This is required when we use the sites middleware

This is incomplete as events etc are not implemented yet, but should suffice as a decent starting point

Closes #27, but we should track this for new apps

* Models and admin page for events
* Add organisers to events
* event overview page for organisers

Output is cleaned with `bleach` in the frontend

Contains page with overview of partners
Contains admin of partners

This should probably be replaced again soon by something nicer,
but this is functionally equivalent to what we had.

This is still wants a nice admin back-end;
currently the way to manage photos is simply managing JPGs

This also wants a few more tweaks in the front-end,
solving some CSS problems and adding album pagination

See #13

Closes #12

Includes tests and an authentication backend to check the permissions
granted to committees.