Fix for shutter speed values from EXIF data

Shutter speeds were not displayed correctly, depending on their value (see https://github.com/Automattic/jetpack/issues/692). With this fix, shutter speeds up to 1/10000 s should be displayed correctly. Also now allows for one digit when shutter speed is greater than 1 s.
Not tested for performance issues on mobile terminals.
Looks good, but I'd love a comment here explaining the formatting trick.