Add unit test bundle
Add a test parent data source to test for updates
Add initial tests for split data source
Add DCTFetchedResultsDataSourceTests
Improve logging, index path creation
Use module style import
Add fetched results data source tests
Add checks to make the updates correct

Concept taken from http://www.fruitstandsoftware.com/blog/2013/02/uitableview-and-nsfetchedresultscontroller-updates-done-right/