2016-05-24, Version 4.4.5 'Argon' (LTS)

Notable changes:

* **buffer**:
  * Buffer no longer errors if you call lastIndexOf with a search term
    longer than the buffer (Anna Henningsen)
    https://github.com/nodejs/node/pull/6511

* contextify:
  * Context objects are now properly garbage collected, this solves a
    problem some individuals were experiencing with extreme memory
    growth (Ali Ijaz Sheikh)
    https://github.com/nodejs/node/pull/6871

* deps:
  * update npm to 2.15.5 (Rebecca Turner)
    https://github.com/nodejs/node/pull/6663

* http:
  * Invalid status codes can no longer be sent. Limited to 3 digit
    numbers between 100 - 999 (Brian White)
    https://github.com/nodejs/node/pull/6291