Supporting NodeJS v4 in Travis CI

[lirantal]

Adding support for nodejs v4 and allowing it to fail without failing the complete build for CI.
Closes #902.

[lirantal]

is it possible this build is actually failing because it doesn't enforce the matrix directive there to allow failures because it's not in the master branch? I have some doubts because it had no problems identifying that we have a new build now for nodejs v4

[lirantal]

Ok, there we go. Now the build passes even though NodeJS v4 is failing. This way we can track it.
@ilanbiala @codydaig let's continue with that to track v4 ready-ness?

[mleanos]

@lirantal Very well done.. Thank you! 👍

[codydaig]

@lirantal LGTM!
:-D Learn something new everyday.

[ilanbiala]

LGTM.

@lirantal did you see the warning about the legacy infrastructure on the build log page? Is there anything we use sudo for? If not, we might as well add sudo: false to the .travis.yml file as well. We would also be able to turn on caching.

cache:
  apt: true
  directories:
  - node_modules/
  - public/lib/

[ilanbiala]

@lirantal not sure if you saw, but I used the caching and new containerized setup for the generator and it speeds up builds pretty quickly. I think you should try it out before merging this in without it.

[lirantal]

@ilanbiala
I saw it was failing but didn't yet review it fully.
Sure I'll make the changes with the caching too and we will take this for a spin, thanks!

[lirantal]

Looks like we are good now @ilanbiala

[ilanbiala]

@lirantal LGTM.

[codydaig]

LGTM