2015-12-23, Version 4.2.4 "Argon" (LTS) Release

Maintenance Update

Notable changes

* Roughly 78% of the commits are documentation and test
  improvements
* domains:
  - Fix handling of uncaught exceptions (Julien Gilli)
    [#3884](https://github.com/nodejs/node/pull/3884)
* deps:
  - Upgrade to npm 2.14.12 (Kat Marchán)
    [#4110](https://github.com/nodejs/node/pull/4110)
  - Backport 819b40a from V8 upstream (Michaël Zasso)
    [#3938](https://github.com/nodejs/node/pull/3938)
  - Updated node LICENSE file with new npm license (Kat Marchán)
    [#4110](https://github.com/nodejs/node/pull/4110)