Support registries with more stuff in them

[virtuald]

trafficstars

This works out great for a few images, but once you start adding lots of images, then visually the images page starts being inconvenient. Some suggestions that come to mind:

• When showing an image (x.com/repo/img:version), use a tree/whatever to hide all versions of the same thing except 'latest' or the last pushed, and allow the user to show/expand that.
• When showing a list of images from a registry, group by the repo name

This software has been really useful for me, thanks!

[virtuald]

At the very least, having the output be sorted would be great.