MongoContentResolver now needs a LookupEntryStore as a collaborator
so that IDs can be injected into resolved content.
MongoContentStore now needs a MongoLookupEntryStore in tests
Add MongoLookupStore to MongoContentResolver
Merge pull request #286 from atlasapi/add-ids-to-content-from-lookup

MongoContentResolver now needs a LookupEntryStore as a collaborator