Display latest package version in search results

Closes #79.

Adds the following to /packages:

* table headers
* new column (latest version)
* removes underline on package name

Preview:
![screen shot 2015-01-01 at 4 57 18 pm](https://cloud.githubusercontent.com/assets/860934/5591736/16fd5fec-91d7-11e4-827e-2ddf5b34db22.png)