Drop support for Node.js v0.10

[Starefossen]

I think we should discontinue support for Node.js v0.10, as mentioned below this version of Node.js is officially discontinued after October 1st 2016.

From nodejs/lts repo:

1. nodejs/node v4.2.0 becomes the current LTS Release
2. joyent/node v0.10 continues in Maintenance only mode until October 1st, 2016
3. joyent/node v0.12 continues as LTS until April 1st, 2016, after which it moves into Maintenance only mode until April 1st, 2017.
4. On or around October 1st, 2016, the second LTS Release from the converged is cut.
5. LTS for v4.2.0 continues until April 1st, 2017, after which it moves to Maintenance mode until around April 1st, 2017.
6. On or around October 1st, 2017, the third LTS Release from the converged is cut.

[anthonyringoet]

Agree to follow the Node guidelines. People on 0.10.x can still use it, albeit without support.