Add support to CI

[blackjid]

We have to defined which CI service are we going to use and how are we going to use it.

I've been playing around with

• http://circleci.com
• http://codeship.io

cc: @platanus/developers

[blackjid]

One thing to take into consideration is how we want to build the test environment.
I see two alternatives:

• Let the CI service to infer the environment and customize it via the provided configuration file
• Use docker to build and environment using the heroku buildpacks.

I think I like the second approach, and for that something like codeship is best suited.

[blackjid]

closed by #49