Show original path information in trashbin and for shares

Hovering over an item in the trashbin or in a sharing overview page will show a tooltip containing the original path of the file in the filesystem

![screenshot - 270814 - 10 48 36](https://cloud.githubusercontent.com/assets/2016878/4057967/5b0da2a8-2dcf-11e4-9448-96cef5506b62.png)

I don't know about our policies for modifying third party files. It's just a stylesheet though, so I thought it would be OK. Can anyone clarify?