Tidy up finder show page header

Adjust padding around header for better presentation.
Reduce font size of heading via component.
Use grid to contain line length.

![screenshot_580](https://cloud.githubusercontent.com/assets/265403/5411036/cf80f20c-81f3-11e4-87f5-28806f385265.png)

![screenshot_581](https://cloud.githubusercontent.com/assets/265403/5411040/d48cacc8-81f3-11e4-98a8-968dd46085c4.png)