Add info command

```
Following a conversation with David Silverberg on facebook, I think we
should add an education component to zmanimbot, where someone can say "info
alos hashachar" (or, once we add hebrew dates, "info tisha b'av" and it'll
give them a blurb and a link.
```

Original issue reported on code.google.com by `mkopinsky` on 9 Jul 2009 at 6:46
