* added generic MailingListView class for list-based views ...

* view code moved from views.py to views/views.py and views/generic.py
* refactored some view functions as subclasses of MailingListView
* added more detailed error messages to mass subscribe view

added auth decorator that checks that the logged-in user is either a superuser or the list owner.

- added empty settings file to doc folder to make sphinx able to import postorius modules ...

- fixed typo in development doc

pep8'ed several files

added list members view template and auth tests (LP: 1004053)

* added tests and view code (draft) for list members page ...

* added developer documentation
* added mock object helpers
* fixed some typos

fixed copyright notices (GNU Mailman => Postorius)

- added messages middleware ...

- tmp disabled outdated tests

- removed some more mailmanweb remains ...

- capped line lengths
- removed some unnecessary files
- added installation instructions
- updated copyright dates

- added missing copyright notices and update old dates ...

- added proper processing of acceptable aliases in list settings form contributed by Daniel Mizyrycki (in Rev. 50)

src/mailmanweb => src/postorius