Fixes #91 - notice states

Adds different states for the notices (was going to be views, but
that’s not necessary). Provides “unread”, “read”, “undeleted”,
“deleted” states for notices. Notices can be read and optionally
deleted from view.

![screen shot 2014-05-02 at 12 59 34 am](https://cloud.githubusercontent.com/assets/704760/2860599/cc6f8724-d1cf-11e3-8493-588f1777e17a.png)

![screen shot 2014-05-02 at 12 59 40 am](https://cloud.githubusercontent.com/assets/704760/2860600/d13ef456-d1cf-11e3-9242-b6ba74570230.png)

![screen shot 2014-05-02 at 12 59 47 am](https://cloud.githubusercontent.com/assets/704760/2860601/d5ec54e4-d1cf-11e3-9cdf-7e4963fdebc5.png)