Conform Gitlab CI variables to 9.0 naming

Closes #372

See merge request !447

Old variables were deprecated

Make Event.organiser NOT NULL

Closes #379

See merge request !443

Makes sure the organiser is always set.

Fix deprecation warnings for Django 1.11

See merge request !444

Also include mailinglist aliasses in API output

Closes #363

See merge request !439

Update requirements (move to Django 1.11)

See merge request !442

Also needed to fix a migration for localflavor 1.4

Also don't test Django 1.10 with Gitlab or Tox anymore

Add permission that overrides event organiser restrictions

Closes #376

See merge request !441

Bound announcements on datetime instead of date

See merge request !438

Dockerfile: Move statics such as entrypoint up in the build

See merge request !437

Fix the ModelAdmin change permissions

See merge request !440

Randomly order vacancies

Closes #368

See merge request !427

Fix setting all users not on waiting list or cancelled to present and paid

Closes #374

See merge request !429

utils/thumbnails: document thumbnail url usage

See merge request !435

Fix path traversal

Closes #377

See merge request !432

Use newer version of flake8

See merge request !433

Fix error for events without organiser

Closes #373

See merge request !431

Patches utils.snippets.sanitize_path and checks for the prefix of the path in the view

Closes #377

Closes #373

Change memberlist text so that it doesnt mentions email or phone numbers

Closes #369

See merge request !428