Create LiteAcceptor to expose socket data in a standard way for TJWS acceptors

[yaronyg]

#25 calls for us to provide standard connection information and #26 depends on this to discover what port the server is listening on when we use port 0. But a complication is that the acceptors used by TJWS do not have a standard way of providing the serverSocket that powers #25.

To work around this I propose that we define an interface:

package com.couchbase.lite.listener;

/**
 * Created by yarong on 11/15/13.
 */
public interface LiteAcceptor {
    public SocketStatus getSocketStatus();
}

So all acceptors used by the Listener would be required to support this interface.