Bump ruby version
aesthetic tweaks

- remove scrollbars
- shrink margins
- maximize used space
- auto-size images in slideshow to account for improperly uploaded
content
Custom classes instead of generic list

- splits date and time for more layout control
Alternate dashboards for demo

- no news
- minimalist (just clock, weather, logo and slideshow)
fix time bug
fix fallback image url
reload page if slides are older than 45 minutes
Handle days where the library is closed all day