Refactoring tests and development environment.

[mwaaas]

What Adding all django session tests to tests all scenarios. https://github.com/django/django/blob/master/tests/sessions_tests/tests.py#L40 refactored tests to use django test runner instead of nosetests

Refactored development to include docker for easy contribution.

Why

• To fully support django session store hence anding django session store.
• For easy development hence dockerizing it.

[joekohlsdorf]

I recommend to use fakeredis for tests.