switched internalchunk property to use MutableProperty. Added signal for watching changes since a public Property for a protocol can not be bound to a MutableProperty of a type implementing that protocol.
switched internalchunk property to use MutableProperty. Added signal for watching changes since a public Property for a protocol can not be bound to a MutableProperty of a type implementing that protocol.

mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient