Add Cid

After the tech Thursday talk to the Open Knowledge team last week about [Cid](https://github.com/theodi/cid), our experimental tool for continuously integrating data packages in Github, I thought I'd give it a go on some of the datasets repos. 

Feel free to merge this and then add your version of the repo to Travis. You'll need to add your own Github oauth token, but, other than that, it should be pretty simple to get going.

Any feedback, please let me know!