ID-porten support and better user matching

See merge request !135

GREG-94: Resend invitation

See merge request !136

Greg 65 notification on start

See merge request !137

Greg 89 login redirect

See merge request !140

Adding missing contact person field on form

See merge request !142

Adding a validation check for role start being before role end date

See merge request !141

If other fields than one of the date fields was changed, an extra task
would be created, causing duplicate notification on the date. We now
check that the field has changed before making a task.

Rate limit invite endpoint

See merge request !134

To prevent hammering on the invite endpoint we throttle requests to the
endpoint to 100/day per ip.

Resolves: GREG-84

Greg 93 fixtures

See merge request !130

Adds support for importing extra indentifies from orgreg

See merge request !138

GREG-103: Fixing issue where passport information was not saved

See merge request !139

Issue: GREG-89

Issue: GREG-89

Issue: GREG-89

The post_save signal now checks if the instance is a Role, and queues a
django q task to produce a Notification on the start and end dates for
the Role. The future task checks if the date has changed after it was
queued and only produces a Notification if today's date matches the date
for the task.

Resolves: GREG-65

We have switched to using Django Q for queuing tasks so the task
scheduler can be removed. A future commit will reintroduce queing of
notifications on the end date of roles.