Write newman tests

[enriquezrene]

As a developer I want to exercise automatically the API so that to be able to check the API health.

The API is pretty small for now so we can use POSTMAN to check how it works. The same postman requests can be exported so they can be stored in the cloud and then make them run automatically using travis.

Task:

• Create requests using postman so that to create, edit and delete skills
• Export the postman requests to newman
• Run the newman tests using travis
• Post to slack or somewhere else the execution result so that to know the API is working