Role of a protocol should be more simply explained/documented

[jeffbcross]

It should be clearer in the docs what the relationship between OmniBinder and a protocol is. It should be clear that OmniBinder does the client-side data marshalling and change syndicating, and leaves it to a protocol to send the data over the wire and manage retrieving updates from a server.

It should be clear that without some protocol, OmniBinder is useless.