Show if package is abandoned on the All Packages page

Hi,

Is it possible to show if a package is abandoned on the `All Packages` page?
Right I regularly stumble upon a nice package, that when clicking trough is abandoned.
It is probably a small thing, but avoids a lot of headache.

I've never really done a pull request, but if that might be the best and fastest way to go, I would love to give it a try :)

Thanks in advanced.