coverage of line 40 in selection page; cleans up template for add_module_item
Merge branch 'feature/track_activation' of https://github.com/penzance/ab-testing-tool into feature/track_activation

Conflicts:
	ab_testing_tool_app/tests/test_track_pages.py
Merge branch 'feature/track_activation' of https://github.com/penzance/ab-testing-tool into feature/track_activation

Conflicts:
	ab_testing_tool_app/tests/test_track_pages.py