modified the replication change event to match the common API. The 'status' event has been removed. The 'change' event now has a property named 'source' which is the replication which fired the event, and a property named 'property' (I know, it's a terrible name) containing the name of the replication property that changed.
cleaned up the error formatting category to return NSNull when the error object is null
added replication progress monitoring
started work on the share screen
add event to refresh view on sync change
add window title
implement share screen selection/deselection