Added wagtail and django settings doc

more settings stuffs

settings stuff

settings stuff

so many things

omg is it really two AM

More docs
Settings doc changes based on feedback
Add UserProfile model
Add notification preferences form, view, template and link from account
Implement checking of user notification preferences before send_notification()
Add link to notification preferences at bottom of email templates
Add userprofile creation method tests
Add tests for notification preferences view
Add tests that notification preferences are respected;
also move existing notification tests to the new test case
Add extra UserPagePermissionsProxy methods:
    - can_edit_pages
    - publishable_pages
    - can_publish_pages
Add tests for new UserPagePermissionsProxy methods
Filter notification preferences form fields according to user permissions
Add UserPagePermissionsProxy tests for a user who can access the admin only
Only show the link to notification preferences if the user has preferences to set
Add tests for notification preferences views' being filtered for less privileged users
Make the 'X Pages/Images/Documents' stats links

They link to the relevant sections of the admin, allowing for quick
jumping around.
Link to the root page, not the site root
Remove unused import added in 66dce8d
Merge pull request #361 from takeflight/feature/admin-stats-links

Make links out of the admin home page 'X Pages/Images/Documents' stats
Changed User.get_profile to UserProfile.get_for_user