transport: Added the Transport base class.
transport: Make transport classes based on Transport and implement ConnectionInfo. Make connect take a ConnectionInfo, not host and port. Store the connectionInfo, not host and port.
Face (internal): Use a Transport.ConnectionInfo instead of host and port. Use this when calling connect. Store the connectionInfo, not host and port. Check the transport connectionInfo, not host and port.
ndn-protocol: Face now stores the connectionInfo, not host and port. Pass an XpcomTransport.ConnectionInfo to createRoute.
tests: Face now stores the connectionInfo, not host and port.
CHANGELOG: Removed Face.host and Face.port and use Face.connectionInfo.