Upgrade the version of node shipped with the build

[megastef]

Please stop distributing node.js v0.10 - and move to latest io.js or at least node 0.12.6 to make latest security patches available.

For example this one: https://medium.com/@iojs/important-security-upgrades-for-node-js-and-io-js-8ac14ece5852

I upgraded succesfully our Kibana 4.1.1 installation to io 2.3.3 on Linux 64 by following steps:

npm n -g 
n io 2.3.3
cd kibana/src
mv node_modules node_modules_old_0_10
npm i 

then change bin/kibana start script

NODE=/usr/local/bin/node 

[simianhacker]

Node v0.10 wasn't affected by the security issue; the plan is for the next release to be based on io.js. @spalger is working on this as we speak, it will be part of the server refactor.

See https://twitter.com/nodejs/status/617131694617853952

[w33ble]

Updated the title and assigned to @spalger since he's already working on this