Added comments to help with explaining some of the Core Data concepts.
Added comments to help with explaining some of the Core Data concepts.

Shooter7119/sequel-pro,Shooter7119/sequel-pro,prabowomurti/sequel-pro,Shooter7119/sequel-pro,Shooter7119/sequel-pro,vieten/sequel-pro,vieten/sequel-pro,prabowomurti/sequel-pro,Shooter7119/sequel-pro,brittneybrinsfield/sequel-pro,vieten/sequel-pro,prabowomurti/sequel-pro,brittneybrinsfield/sequel-pro,prabowomurti/sequel-pro,prabowomurti/sequel-pro,brittneybrinsfield/sequel-pro,brittneybrinsfield/sequel-pro,vieten/sequel-pro