Merging Stylistica's GSoC code. Yeay! ...

There are some outstanding style issues here, but we're going to fix them 
after the fact at Open Source Day rather than beforehand, just to give
participants some easy bugs to find and fix.

Cleaned up the code, added help-text, simplified the design

Completed adding the 3 types of user preferences

fixed client property in MailmanClientMixin

Adding user's global Mailman preferences

This will stop failures in list creation from displaying doule error messages

removed unwanted try except blocks and kwargs from user_delete method

* start/stop isolated mailman instance when running tests in mailman_api_tests dir. ...

* initialize mailmanclient.Client with test credentials when running tests
* removed client attr from MailmanRESTManager; uses get_client instead

added deleting of user functionality by adding user_delete method in user.py and creating a confirmation page user_confirm_delete.html. This patch will enable the superusers to delete other users.

Changed view comment.

- removed abandoned view function (preferences) ...

- user_mailmansettings is now class-based and lives in views/user.py

DRY up the construction of the Mailman REST Client ...

Also convert to use the same settings ad those
used by Hyperkitty

Slightly improved messages for when the REST API isn't available, telling people to start Mailman core. The wording here could probably use some improvement, but this should be more helpful in the meantime.

Merging change from mgill25 to add confirmation messages in places where we had none.

Bug #1004052 - Display confirmation on list settings update

added pagination to user and list member pages (LP: 1156529)

* added pagination on members view ...

* changed settings page

Merging mahendra007-s's patch for Bug #1062849. Clicking the 'more info' link now brings up a new page with the information; very important for users who coudldn't see the mouseover before.

Have top page invite superuser to create a domain if none exist yet.

Fix so the subscription page won't crash if you don't have any subscriptions yet

Adding a 'blank' settings page for when the user is not yet subscribed to any lists

Fixed error on user/subscriptions page

added domain deletion (LP: 1062891)

hange "todos" to "tasks" and display as "To Do"

* added success/error messages to moderator/owner form. ...

* removed some things pyflakes complained about.

removed unneccessary module import (requests)

* moved some sub navs to template tags ...

* generic MailingListView now detects list owners/moderators even if those permissions are not required
* fixed some permission bugs in the list navigation
* changes to the list member page:
    - list owners and moderators
    - "add owner" feature
    - "add moderator" feature
* several layout changes:
    - sub navigation items now have an "active" state
    - changed backgrounds of page and content containers
* added "add owner" feature
* added "add moderator" feature
* several text changes

removed unnecessary import

* added subscription list page for logged in user ...

* added decorator to allow login via http basic auth (to allow non-browser clients to use API views)
* added api view for list index
* several changes regarding style and navigation structure

* modified subnav styles ...

* added is_list_(owner|moderator) flag to request.user
* added section headers
* added icons
* added draft test for user_save/add mm_user hook