Fixed `pod lib lint` warnings, mostly for OS X.
Defined an interface for interacting with persistent stores.
Fixed some typos in the API documentation.
Clarified the behaviour of sync in preview mode.
Updated cassettes for offline testing.
Implemented an example subclass for integrating Core Data using the CDAPersistenceManager class.
Added a test case for Core Data.
Updated development Pods.
Updated static framework build.
Extracted Core Data specific functionality in the manager class.