bump nodejs to 6.11.0 LTS

[csantanapr]

Closes #2076

[csantanapr]

Need to skip 6.10.1 and pick 6.10.2 when it's out soon
nodejs/node#12037

[csantanapr]

PG running PG1 1731

[csantanapr]

picking up nodejs 6.11

[markusthoemmes]

I think you can safely remove this, we're not using ant anymore.

[rabbah]

Update references doc?

[csantanapr]

yeah doing the docs, forgot to push

[csantanapr]

PG3 800 🔵

[csantanapr]

I think I'm going to wait to push this and pick up this update related to security
https://nodejs.org/en/blog/vulnerability/july-2017-security-releases/

The Node.js project will be releasing new versions across all of its active release lines (4.x, 6.x, 8.x) as well as 7.x the week of July 10th 2017 to incorporate a security fix.

[csantanapr]

Also debating how do I update the npm packages:

1. update all npm packages to latest
2. update only minor and patch levels
3. leave npm packages alone and just update nodejs

Also looking at option on creating a new kind nodejs:6.11 and update both node and npm packages to latest, leave nodejs:6 alone as is

[rabbah]

@csantanapr is this pr abandoned?

[csantanapr]

Updating will be done in the new repo