Add a Codeship banner to README

…since we're building and deploying there.
Add Shellycloud "Cloudfile" and switch to thin

* This is only the staging configuration for now
* Don't be sad about losing unicorn [0]

[0] https://shellycloud.com/blog/2013/05/is-shelly-cloud-faster-than-heroku
Merge pull request #53 from eurucamp/deploy-to-shelly

Add Shellycloud "Cloudfile" and switch to thin