Responsive view

Hi there!

During Trans*H4CK Boston we made a Yo app to get nearby Refuge Restrooms. To this end, we fixed the responsive design (especially for the smallest screens) of restrooms#index and restrooms#show. We also moved the mobile styles into _mobile.css.scss

[1]: https://github.com/raptortech-js/YoRestrooms by @raptortech-js