Add some scrolling to the Thumbnail bar.
Restore the double-border on .gal-next IF thumbnails aren't hidden
Focus a focusable element instead of trying to focus the image
Fix #164
Merge Zixaphir X
Allow enter key to open file dialog once
Get some rudimentary error handling setup in the gallery
This is mostly just Mayhem's ImageExpand error code, refactored
for the context of the gallery.
Separate Gallery and Image Expansion fit width / height
Sometimes, I'm dumb
CSS
Merge branch 'v3'

Conflicts:
	LICENSE
	builds/4chan-X.user.js
	builds/crx/script.js
	src/General/css/style.css
	src/Images/Gallery.coffee