Add new variable !commentteaser

Hi again,

It would be great if we could add a variable called !commentteaser that could then be added to the notification emails. This would be (of course) a teaser of the comment itself, with the idea that if the user is presented with a teaser, they are more likely to click-through and go to the page itself. Currently you just get a message that says "You have a new comment" with no indication of what it is, and you might not be inclined to click-through.

It would also be sweet if you could set a limit to the number of characters for the teaser. For example, the admin could set the number of characters to "55" for the comment teaser.

Not sure how much desire there is for this feature, although I might be pleasantly surprised. Thanks again for this awesome module, which is indispensable in my opinion.