Add support for Django 1.7 including AppConfig and new migrations

This PR provides support for Django 1.7 in the standalone part of fancypages. Currently, the support for the Oscar integration is not available until Oscar is supporting Django 1.7.
That's what I thought. But for some reason, ``pytest`` picks the removed line up as a filename and fails because it doesn't exist. Removing the quotes seems to fix it. :confused: