• Fixed an issue where the data sources' constructors had side effects.
• Removed FUIDataSource class.
• Added a queryErrorHandler property to the data sources to handle fatal data source errors.
• Renamed data sources' objectAtIndex: to snapshotAtIndex:
• Added bindToView: and unbind methods to data sources so developers can control the timing of query observation more directly through the data sources.
• Data sources no longer immediately observe their queries when instantiated.