All processables are now created with an instance of Configuration, and they use that instance's settings.
Added Configuration.CreateEphemeralCopy() to clone Configuration without persistence.
- Added `MockLibraryBook` which contains factories for easily creating mock LibraryBooks and Books
- Added mock Configuration
- New `IPersistentDictionary` interface
- New `MockPersistentDictionary` class which uses a `JObject` as its data store
- Added `public static Configuration CreateMockInstance()`
- This method returns a mock Configuration instance **and also sets the `Configuration.Instance` property**
- Throws an exception if not in debug
- Updated all chardonnay controls to use the mocks in design mode. Previously I was using my actual database and settings file, but that approach is fragile and is unfriendly towards anyone else trying to work on it.
