Add test cases

[germanattanasio]

We need tests cases to make sure that code changes don't break the existing functionality. We need to choose a good framework to mock rest calls.

I heard good comments about http://www.mock-server.com/

• Add coveralls.io
• Choose the test framework to use
• Add test cases for the GA services

[germanattanasio]

HI @alseddnm, can you help me with this?

[germanattanasio]

fixed by @alseddnm