2016-06-23, Version 5.12.0 (Stable)

Notable changes:

This is a security release. All Node.js users should consult the security
release summary at https://nodejs.org/en/blog/vulnerability/june-2016-security-releases
for details on patched vulnerabilities.

* **buffer**
  * backport allocUnsafeSlow (Сковорода Никита Андреевич) [#7169](https://github.com/nodejs/node/pull/7169)
  * ignore negative allocation lengths (Anna Henningsen) [#7221](https://github.com/nodejs/node/pull/7221)
* **deps**: backport 3a9bfec from v8 upstream (Ben Noordhuis) [nodejs/node-private#40](https://github.com/nodejs/node-private/pull/40)
  * Fixes a Buffer overflow vulnerability discovered in v8. More details
    can be found in the CVE (CVE-2016-1699).

PR-URL: https://github.com/nodejs/node-private/pull/51