2017-12-05, Version 6.12.1 'Boron' (LTS)

Notable Changes:

* build:
  - fix npm install with --shared (Ben Noordhuis)
    https://github.com/nodejs/node/pull/16438
* build:
  - building with python 3 is now supported (Emily Marigold Klassen)
    https://github.com/nodejs/node/pull/16058
* src:
  - v8 options can be specified with either '\_' or '-' in NODE_OPTIONS
    (Sam Roberts) https://github.com/nodejs/node/pull/14093

PR-URL: https://github.com/nodejs/node/pull/17180