Changed global confirmDialog implementation to a flexible Behavior impl.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9511 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fixed show message in dialog api.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9514 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c