2.2.0

• Adds new experimental ballast-sync module for synchronizing ViewModel states. Out-of-the-box only in-memory synchronization is supported, but it is possible to write your own network adapter.
• Adds new experimental ballast-undo module for adding State-based undo/redo functionality to any ViewModel.
• Fixed an issue where exceptions thrown by an Interceptor would crash the entire ViewModel without logging the exception. Now, those exceptions are caught and sent to the BallastLogger as a BallastNotification.UnhandledError.