Create a base UIViewController subclass for interfacing with Core Data

Closes #14
KFDataTableViewController should become a UITableViewDataSource

Closes #13
Create an example iOS application using KFData

Closes #5
Merge branch 'development'
Remove redundant code from merge
Create a UICollectionViewController subclass to manage an NSFetchRequest

Closes #12
Ignore example project workspace
Add a helper method to delete all managed objects excluding an NSSet
KFDataTableViewController: Make properties writable to ourself
UIViewController's shouldn't know about KFDataStore
Fix a bug where nested save doesn't go up multiple levels of parent contexts
Convenience methods

refactor
Merged with master