apps.coredao: Deleted. Not in use.

See #630.
apps.statistics: Deleted. Not in use.

See #630.
Moved devilry.apps.superadmin to devilry.superadmin.

See #629.
Removed devilry.apps.statistics from INSTALLED_APPS.

See #630.
Moved devilry.superadmin to devilry.devilry_superadmin.

See #629.