2016-12-06, Version 4.7.0 'Argon' (LTS)

This LTS release comes with 108 commits. This includes 30 which are doc
related, 28 which are test related, 16 which are build / tool related,
and 4 commits which are updates to dependencies.

Notable Changes:

The SEMVER-MINOR changes include:

* build:
  - export openssl symbols on Windows making it possible to build
    addons linked against the bundled version of openssl (Alex Hultman)
    https://github.com/nodejs/node/pull/7576
* debugger:
  - make listen address configurable in the debugger server
    (Ben Noordhuis) https://github.com/nodejs/node/pull/3316
* dgram:
  - generalized send queue to handle close fixing a potential throw
    when dgram socket is closed in the listening event handler.
    (Matteo Collina) https://github.com/nodejs/node/pull/7066
* http:
  - Introduce the 451 status code "Unavailable For Legal Reasons"
    (Max Barinov) https://github.com/nodejs/node/pull/4377
* tls:
  - introduce `secureContext` for `tls.connect` which is useful fo...