Issue summary now lists issues by both category and status

[mark.reinhold at oracle.com]

I've enhanced the issue summary to list issues by category, as before,
and also by status, so that it's easy to see where we are:

  http://openjdk.java.net/projects/jigsaw/spec/issues/

I expect to post proposals or start discussion threads for all of the
remaining open issues during the next few weeks.

- Mark