Mobile-friendly styles for licences

Additional CSS to target devices with small screen width. Also fixed minor config path typos in the readme.

I've tested against LTR and RTL languages on different versions of each licence, but I'd welcome any feedback on the PR.

[Here's a screenshot from CC BY 4.0 en](https://cloud.githubusercontent.com/assets/80938/4836965/5eb21aee-5fcd-11e4-8143-aa5a80d95b75.png).