Update Atmosphere implementation to 2.2, improve code robusness

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11792 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11793 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c