Upgrade node to 6.3.1 (#966)
Upgrade node to 6.3.1 (#966)

### Notable changes

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