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)
    [nodejs#3884](nodejs#3884)
* deps:
  - Upgrade to npm 2.14.12 (Kat Marchán)
    [nodejs#4110](nodejs#4110)
  - Backport 819b40a from V8 upstream (Michaël Zasso)
    [nodejs#3938](nodejs#3938)
  - Updated node LICENSE file with new npm license (Kat Marchán)
    [nodejs#4110](nodejs#4110)