[ADD] shippable_install_nightly: Add compatibility for shippable

Travis today is down.
We need other CI tool.

Shippable is a good option.
  -Work with .travis.yml file.

To test it we will need that a 
[owner](https://github.com/orgs/OCA/teams/owners) 
  @jgrandguillaume 
  @StefanRijnhart 
  @gurneyalex 
Make a user with shippable and enable MQT repo, please.
![descarga](https://cloud.githubusercontent.com/assets/6644187/5258849/b07ee6b4-79bc-11e4-80d5-8904e35160fd.png)