Add 'more information' link to member summaries

With appropriate style changes. Resolves theodi/open-orgn-services#204

It all scales nicely down to smaller screen sizes too.

![Screen Shot 2013-03-19 at 15 12 32](https://f.cloud.github.com/assets/3565/276265/d6258670-90a7-11e2-9020-67120db3027a.png)