Make sure events registration uses POST and is done when 'register' is pressed

Closes #340 and #346

See merge request !411

Enable session and basic authentication for rest framework

See merge request !412

Changes board page to show older boards below

Closes #307

See merge request !375

Fix regexes of urls in documents app

See merge request !408

The $ is important to note that it is a terminal

Make sure username is present in form submit

See merge request !403

Allow the REST framework to use token authentication

See merge request !402

Fix user change form after forcing lowercase

See merge request !401

Fix png that's actually a jpeg

See merge request !400

Optimised PNGs

See merge request !399

Tekst 'Naar evenementenpagina' bij verjaardagen weggehaald

Closes #320

See merge request !373

Position color information / options side by side

See merge request !398

[Hotfix] [1.4] Comparing to False does not work on postgres

See merge request !396

Prepare for Django 1.11

See merge request !391

Api login handles json post requests

See merge request !377

Get rid of Context() in events/views.py and newsletters/views.py

Allow tox to run django based on env choice

Don't complain about missing interpreters

Fix the thing that was fixed in !393

See merge request !395