2016-07-21, Version 6.3.1 (Current)

Notable changes:

* **buffer**:
  * Improve performance of Buffer.from(str, 'hex') and Buffer#write(str, 'hex'). (Christopher Jeffrey) https://github.com/nodejs/node/pull/7602
  * Fix creating from zero-length ArrayBuffer. (Ingvar Stepanyan) https://github.com/nodejs/node/pull/7176
* **deps**:
  * Upgrade to V8 5.0.71.xx. (Ben Noordhuis) https://github.com/nodejs/node/pull/7531
  * Backport V8 instanceof bugfix (Franziska Hinkelmann) https://github.com/nodejs/node/pull/7638
* **repl**: Fix issue with function redeclaration. (Prince J Wesley) https://github.com/nodejs/node/pull/7794
* **util**: Fix inspecting of boxed symbols. (Anna Henningsen) https://github.com/nodejs/node/pull/7641

PR-URL: https://github.com/nodejs/node/pull/7782