The Hammock client is no longer supported largely because the Hammock project itself is no longer maintained. That being said, the Hammock and RestSharp Http clients were moved to a separate assembly in the solution and can still be used.
To do so:
Clone or fork the source from Github: https://github.com/couchbase/couchbase-net-client
Create a new project and reference Couchbase, Couchbase.HttpClients and Enyim.Caching
Setup your config file like this:
<?xml version="1.0" encoding="utf-8" ?>
I just tried the steps above and it worked as expected, however, I would advise you to use the DefaultHttpCLient which comes with the Couchbase project in any production deployment.