2016-03-16, Version 5.9.0 (Stable)

Notable changes:

* **contextify**: Fixed a memory consumption issue related to heavy use
of `vm.createContext` and `vm.runInNewContext`. (Ali Ijaz Sheikh)
https://github.com/nodejs/node/pull/5392
* **governance**: The following members have been added as
collaborators:
  - Andreas Madsen (@AndreasMadsen)
  - Benjamin Gruenbaum (@benjamingr)
  - Claudio Rodriguez (@claudiorodriguez)
  - Glen Keane (@thekemkid)
  - Jeremy Whitlock (@whitlockjc)
  - Matt Loring (@matthewloring)
  - Phillip Johnsen (@phillipj)
* **lib**: copy arguments object instead of leaking it (Nathan Woltman)
https://github.com/nodejs/node/pull/4361
* **src**: allow combination of -i and -e cli flags (Rich Trott)
https://github.com/nodejs/node/pull/5655
* **v8**: backport fb4ccae from v8 upstream (Vladimir Krivosheev) #4231
  -  breakout events from v8 to offer better support for external
     debuggers
* **zlib**: add support for concatenated members (Kári Tristan
Helgason) https://github.com/nodejs/node/pull/5120

PR-URL: https://github.com/nodejs/node/pull/5702