Add unit test for JSON conversion
Get rid of unused instance variable
Move all the data-related functions and properties to GTDataManager, separating these concerns from GeoTaggerAppDelegate
Get rid of unnecessary lazy initializers for all managedObjectContext, managedObjectModel, and persistentStoreCoordinator. Instead, set them all at once in private initializer for GTDataManager. If you're requesting a GTDataManager, most likely you're going to need one of the 3 properties contained within it.
Merge pull request #8 from jasonko/master

Unit test for GTDataManager