Updated versions of dependencies. Cleaned up general files.
Updated to Python 3. Updated README.rst.
Bumped version to 2.0.0-dev. Cleaned up.
Updated player app to Django's new app system. Changed auth user.
Massive refactoring.
Update first German example game according to new database design.
Update second German example game according to new database design.
Updated German translation.
Template fixes

Fixed missing template tag and filter library in template of message detail view.
Fixed wrong heading in template of card detail view.
Fixed bugs in card detail view, card list view template and home view template.
Fixed typos in README.rst
Updated introduction text of German example game 2.
Added view to print form for playing cards.
Updated requirements to use own snapshot of django-constance.
Updated README.rst, language files and .gitignore.
Updated game "Wissen ist Macht".
Release 2.0.0
Merge branch 'release_2.0.0' into master.