Add migration dependencies to resolve DeserializationError

The initial_data.json fixture for the varify app depends on the Permission and ContentType records for the samples app to be in the DB. To accomplish this, varify's initial migration now depends on samples's initial migration to force the permissions and types to be created.

Signed-off-by: Don Naegely <naegelyd@gmail.com>
Merge pull request #279 from cbmi/issue-268

Add migration dependencies to resolve DeserializationError