Reviewed by Eric Seidel.

        [reviewtool] Add a field for overall comments
        https://bugs.webkit.org/show_bug.cgi?id=45273

        This patch does a couple logically separate things that could be
        separated into smaller patches:

        1) This patch adds an "overall comments" field where you can enter
           overall comments about the patch.  These comments appear at the top
           of the bugzilla posting.  Currently, these aren't redisplayed when
           viewing the patch, but I plan to add that in a future patch.

        2) This patch renames some of the CSS classes to more consistently
           follow the camelCase style that PrettyPatch uses.

        3) This patch moves the "prepare comments" button to the left of the
           toolbar and renames is to "publish comments".  This makes more sense
           when you scroll to the bottom of the page and enter in some overall
           comments.

        4) When you attempt to add a comment to a line that already has a
           "frozen" comment, we now unfreeze the comment instead of doing
           nothing.  The old behavior was kind of frustrating if you didn't
           know that you could unfreeze a comment by clicking on it.

        * PrettyPatch/PrettyPatch.rb:
            - Update CSS.
        * code-review.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@66849 268f45cc-cd09-0410-ab3c-d52691b4dbfc