change default approach to fetching configuration to use memcached binary protocol

To support better faster, more reliable response to configuration changes, libcouchbase 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, or it can work from existing methods.

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