Notes on standard .travis.yml file compenets about ci-helpers

[kevina]

Concerning email, I actually find it useful, but i agree in the way Travis handles it is annoying. We should probably be consist in our config files. Should I add

notifications:
  email: false

If it was not there already. Also, probably less important. Should I add the other bit if it was not already there:

cache:
  directories:
    - $GOPATH/src/gx

cc @Stebalien @whyrusleeping

[Stebalien]

Use sudo: false as much as possible. If it passes with sudo: false, use it. With sudo, we can use a container (fast), without sudo, we have to use a VM (slow).

Everything else looks good.

[kevina]

@Stebalien okay I will go back though and add sudo:false and make a note when it fails.

[Kubuxu]

Yes , add the cache and emails.

[whyrusleeping]

Yeah, i would disable the emails, and add in caching. Caching the gx directories will save us a lot of time.

[kevina]

Okay I added those two components if they where no already there.