style and styleClass for messages

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10792 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Attempt to fix dialog framework ajax issues with IE. Requires confirmation after testing by Sudheer.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10793 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c