version 1.3.1 (build 13)

fix crash when reverse sorting an empty list
reënable use of scrolling to advance slideshows *except* when using a magic mouse/trackpad/momentum scrolling device
fix slideshow not appearing on second display on 10.9
fix: slideshow window in the background did not update properly when files were deleted in a browser window
fix degree symbol in EXIF display
fix auto-advance paused string to format decimals correctly
fix broken filesystem watching and improve handling of invisible directories
update version check to handle larger system versions
stricter response parsing for version checker