Add extra output when checking review request statuses.
Add extra output when checking review request statuses.

Originally, rbt status would only show the review request summary and the review request id.

The change will give the status of each review request, showing how many 'Open Issues' there are or how many 'Ship It!' there are. If there are no open issues, and the review request hasn't been submitted, it shows the 'Ship It!' count

Below is an example output:

```
(rbenv)vagrant@precise64:/src/reviewboard-2.0.x/reviewboard$ rbt status
===========================================================================
Status            Review Request
===========================================================================
Open Issues (2)   r/5 - Integer a amet Aliquam pharetra dui
Draft             r/6 - Quisque adipiscing tortor,  amet velit orci
Ship It! (1)      r/3 - adipiscing congue ac fames non,  posuere
Pending           r/7 - ipsum id. mi dui,  Integer laoreet
Pending           r/4 - magna In aliquet tincidunt egestas Suspendisse

(rbenv)vagrant@precise64:/src/reviewboard-2.0.x/reviewboard$
```

Testing Done:
Ran rbt status to get the above output.

Ran rbt tests.

Reviewed at https://reviews.reviewboard.org/r/7640/

datjwu/rbtools,reviewboard/rbtools,datjwu/rbtools,reviewboard/rbtools,reviewboard/rbtools,davidt/rbtools,davidt/rbtools,davidt/rbtools,datjwu/rbtools