Large namespace change: url naming convention of 'ab:' -> 'ab_testing_tool_'
Merge branch 'feature/namespacing_change' into feature/backend_updates

Conflicts:
	ab_tool/templates/ab_tool/control_panel.html
	ab_tool/templates/ab_tool/edit_experiment.html
	ab_tool/templates/ab_tool/experimentsDashboard.html
	ab_tool/tests/test_main_pages.py
	ab_tool/urls.py