Fixing a few issues that were raised when apps where used that did not live in the python path directly (e.g. tests.simple_game).
Adding simple_game as test app to the tests. However the game raises 'simple_game_player.session_id may not be NULL' when clicking through it.
Fixing issue for apps that have dots in their name.
Using unix lineendings in simple_game/Results.html
Loading otree_tags in simple_game/Results.html
Merge branch 'master' into test-structure

Conflicts:
	otree/models/__init__.py
	otree/models/subsessions.py
	otree/views/abstract.py
Adding show-case tests for create_sessions management command.