Releasing 2.0.0-beta

Change-Id: I18b9eb1a64cafb646113fa8b03bf464b4fe26eae
Reviewed-on: http://review.couchbase.org/40848
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>