2016-10-18 Version 0.12.17 (Maintenance) Release

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

Notable changes:

* c-ares: fix for single-byte buffer overwrite, CVE-2016-5180, more
  information at https://c-ares.haxx.se/adv_20160929.html
  (Daniel Stenberg)

PR-URL: https://github.com/nodejs/node/pull/9147