* Add more examples (XATTRs and RBAC user management).
* PCBC-505: Enable error maps for libcouchbase 2.8.0. For higher versions it will be enabled by libcouchbase.
* PCBC-499: Expose more query options on N1QL query for advanced tuning query performance
* PCBC-485: Expose enhanced error message. The server might fill properties "context" and "ref" of the error.