Expose a RemoteEndpoint.isOpen API

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10699 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Add Reply Support to EventBus, improve Javadoc

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10700 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c