POC impl of new dialog framework

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@8808 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fixed #5334

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@8810 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c