Add class to 'comment awaiting moderation' element

[nacin]

On my site, I needed to override twentyten_comment() just so I could effectively target the <em> element that contains "Your comment is awaiting moderation."

This is derived directly from Walker_Comment.

I wished we could wrap that in a <div> without screwing up a lot of styling, given that it is generally styled as a de-facto block-level element -- indeed, it is followed immediately by an unsemantic <br/> -- but maybe we can just add a class to it?

Patch attached that handles both Walker_Comment and twentyten_comment.

[westi]

Looks good to me.

[iandstewart]

Adding a class makes the most sense to me. Looks good.

[nacin]

(In [16028]) Add a class to 'Your comment is awaiting moderation' in the comment walker and Twenty Ten's callback. fixes #15206.

[automattor]

(In [17739]) More Twenty Eleven cleanup and add the comment-awaiting-moderation class. see #17198. see #15206 for history on the CSS class.