Add a command to get pod info

Closes #15

```
$ pod trunk info QueryKit
QueryKit
    - Versions:
      - 0.8.0 (2014-06-19 22:24:21 UTC)
      - 0.8.1 (2014-06-20 17:07:18 UTC)
      - 0.8.2 (2014-09-03 16:45:20 UTC)
      - 0.8.3 (2014-09-03 16:57:36 UTC)
    - Owners:
      - Kyle Fuller <kyle@example.com>
```