Better media listings

Things like the groups, orgs and related items listings don't look good when they have real data in them. The images have odd behaviours (e.g. they get cut off when hitting the max-height), incorrect truncation lengths on items, etc.

They need to be boxified to make them display better and also perhaps they should behave a bit more like masonry (see http://masonry.desandro.com/ for context)

![screen shot 2013-05-01 at 15 03 19](https://f.cloud.github.com/assets/67366/449145/b1b748f8-b269-11e2-8e89-392dab5444f3.png)