Setting the background color of LoggingPopup using Style so it works correctly on IE. Also scrolling the log to the bottom when log items are added.

Review at http://gwt-code-reviews.appspot.com/989801

Review by: unnurg@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9048 8db76d5a-ed1c-0410-87a9-c151d255dfc7