add new approach to retrieve configuration over memcached binary protocol

To support better faster, more reliable response to configuration changes, the .NET client should change from HTTP streaming configuration to the new memcached binary protocol method delivered under project CCCP.

This may require adding new constructors and app.config options to be hostname and optionally port number driven.

This is part of project CCCP, as covered at http://www.couchbase.com/wiki/display/couchbase/Cluster+Configuration+Carrier+Publication