First shot on custom user management
Always put Meta before methods
Fix login and admin access broken
iwyu
Add login/logout pages (cf #20)
Add mention of IRC chan on README
Merge branch 'master' into custom-user

Conflicts:
	README.md
Merge branch 'custom-user' into login-logout
README wording
Stricter pytest marker declarations in conftest
better indent
More docstring for user models
Typo in "nationality" field name
Missing camp_activities label and blank params
Use a single models.py file for now (more readable)

Let's spit again in the future if we see the need for real
Move factories to a dedicated file instead of __init__.py
Move factories test to a dedicated file
Do not save UserFactory when not needed
First shot on documentation, including install and user model pages
Handle coverage in a separate PR