Add CI support

[brauliodiez]

Steps to get started:

• Create a fork of this repo.
• Go to travis website and link your github account.
• Enable CI on your project (travis will have granted access to your project).
• Add to the root of your code a file name:

.travis.yml

• The content of that file should look something like

dist: trusty
language: node_js
node_js:
  - "8.9.4"

script:
    - npm install && npm test

Just run the build manually on travis check that you get results, try to make a test change and commit, check that the CI is getting fired.

Once you are done we will create a branch on the real project and add the .travis.yml file