Store next url redirect for in session to work with oauth login callback

# Conflicts:
#	realms/modules/auth/views.py

Update flask versions

Make modules contain their own static files and templates

Added missing global node package to Dockerfile: clean-css

Search is now blocked for anonymous users on PRIVATE_WIKIs

Render error when importing wiki pages that do not exist.

Remove gittle dependency and use dulwich directly

# Conflicts:
#	realms/modules/wiki/models.py

Use github's anonymous email when github auth user has private email

Cause an error when trying to hook invalid HookMixin method

History optimization/improvement fix #149

# Conflicts:
#	realms/modules/search/commands.py

Fix CLI registration for module command groups. fix #103