Integrated moderation with app registration system

[damilare]

• Added test apps
• Created utils package in tests
• Moved utils.py to a utils.base
• added cms_config with configure_app logic

[damilare]

Waiting on https://github.com/divio/djangocms-moderation/pull/32 to get merged so as not to duplicate efforts made in that branch @czpython @mmoravcik