Use Django-mailman3

Move more things to django_mailman3

Use the new django-mailman3

Merge branch 'thelinuxguy/postorius-fix-iterator' into 'master' ...

Fix code for django 1.10 compatibility

Closes #129
The changes are backward compatible and should work with versions < 1.10

* Fix the iterator
* Update tests for 1.10
* Update CI to test for 1.10

See merge request !169

Update tapes

Make the test simpler (we don't need to check attributes)

List descriptions can't contain newlines ...

See mailman/mailman#273. The info property is the one where newlines
can be.

Change test, so it passes for django-latest

Add django 1.10 to testsuite

Make code compatible with django 1.10

Fix paginator for django 1.10 compatibility

Allow resetting a member moderation action

fix some more documentation

minor documentation fix

Merge branch 'master' into 'master' ...

Added notes about installing src modules when setting up development environment

When running through the setup as a beginner, I ran into an error because the packages that were pulled down from PyPI did not have all the features/implementations that were needed for a local build. I was told that its a common practice to use the modules from source when developing locally, so I wanted to add a note about using source modules so others may try this before filing potential bug reports. I added example usages as well of how to install from source as well.

See merge request !155

Merge branch 'bump-version' into 'master' ...

Bump version in setup.py

Fixes #134 

See merge request !157

Added note about using source repos for local development to setup.rst

Bump version in setup.py

Avoid a very expensive API request

Merge branch 'fix-example-project' into 'master' ...

Fix example project

* the requirements needed an update so the git version of mailmanclient is used.
* the "home page" url didn't work due to a wrong import

See merge request !150

Update readme

Fix urls for example project

Update requirements for example project

Make the example settings closer to the old standalone settings

Use a specific settings files for testing

Add missing include in MANIFEST.in

Fix Flake8 errors

Merge branch 'create-demo-project' into 'master' ...

Add demo project to postorius

Most of the django project I know keep a demo project inside the repository of the application.
I included a readme with instructions on how to run postorius. This essentially replaces postorius_standalone. 

See merge request !105

Fix more tox errors

Fix record mode