Send only newly-added comment to newComment watchers

As it was, it was grabbing all the existing sibling comments in addition to the new comment. This change selects for just the new comment and sends that to the newComment watcher callbacks.
fixed .addNewCommentFormHandler for Opera
Merge remote-tracking branch 'upstream/master' into fix-editors
Merge pull request #304 from patricksnape/fix-editors

Fix editors