2016-05-05, Version 5.11.1 (Stable)

Notable changes

* buffer: safeguard against accidental kNoZeroFill (Сковорода Никита Андреевич) [nodejs/node-private#35](https://github.com/nodejs/node-private/pull/35)
* deps: upgrade openssl sources to 1.0.2h (Shigeki Ohtsu) [#6552](https://github.com/nodejs/node/pull/6552)