Node 1.5 no longer supported

[zenspider]

                              DEPRECATION WARNING                            

  Node.js v5.x is no longer actively supported!

  You will not receive security or critical stability updates for this version.

  You should migrate to a supported version of Node.js as soon as possible.
  Use the installation script that corresponds to the version of Node.js you
  wish to install. e.g.

   * https://deb.nodesource.com/setup_4.x — Node.js v4 LTS "Argon" (recommended)
   * https://deb.nodesource.com/setup_6.x — Node.js v6 Current

[dblandin]

We're moving to v8.4.0 in our cronopio beta channel, so we should be able to close this out soon.