Add a buglist for people in the Firefox group.

Benjamin, please let me know if there's anything you'ld like me to add or change to make this suitable for merging.

Thanks!

[[selfie-placeholder-1]]

The current pattern of creating a Post and then populating its bugs in two steps is a little awkward. I suggest that this method should both create the Post and populate its bugs in a single call. That way in the rest of model.py, the pattern can just be:

```
posts = [create_post_with_bugs(r) for r in cur.fetchall()]
```