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)

Ah sorry... I thought the trashbin entries were read from the DB but it seems they're now read directly from the filesystem...
Seems that SQL will be called individually for every file ? Might be slow when there are many files.
Another strategy is to retrieve chunks of 1000 entries.