Show the number of comments next to a commit in the saved search view

[philc]

This will help you spot commits under discussion. In the case where you're trying to get your list down to zero because you're filtering by unapproved commtis only, if there's a commit that's sitting there unapproved and has a bunch of comments next to it, this will help you remember that it is a work in progress.

We should not show the comment indicator next to the commit if there are no comments, and we should make the indicator really low profile, e.g. [num][32px comment icon]

[cespare]

From #67: Mike suggests showing approved status as well. We could probably do this in a minimal way, such as showing a "+1" by approved commits or giving them a different bg color.