Add BirdLife status

[Adam Winer]

Original [issue 25](https://code.google.com/p/scythebill-birdlist/issues/detail?id=25) created by adam_winer on 2011-01-04T17:38:33.000Z:

We have fields for status (critically endangered, vulnerable, etc.); ideally, these should be used and displayed (prominently) in the UI, and made available to query.

[Adam Winer]

Comment [#1](https://code.google.com/p/scythebill-birdlist/issues/detail?id=25#c1) originally posted by adam_winer on 2012-07-30T06:07:03.000Z:

IUCN redlist, but otherwise done.