* Use SILENCED_SYSTEM_CHECKS warning instead of test runner hack to
avoid the warning about a change in default test runners
* Conditionally use south in the demo settings
* Add native migrations and app configs for forked apps
This change might need to be re-applied if more migrations get added
before this PR is merged into master.
More changes need to be done regarding migrations; this commit just
moves them out of the way so that Django doesn't pick them up.
Maik Hoepfel
David Winterbottom