files toggle in admin, maybe as Massimo would want it

files list sliding sidebar.
When we land on the admin edit page, the sidebar is intentionally shown and hidden after 1000 milliseconds so the user knows that it is there. By moving the mouse pointer on left margin of the page, the sidebar is shown again in order to select another file to be edited. The sidebar is on the top of the edit area that covers the whole page width.

![files_menu_bar](https://f.cloud.github.com/assets/3496662/816290/e86dc0ee-ef3f-11e2-8cfe-420bc6fe95a3.jpg)