Quick fix for dynamic cols sort

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9351 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Add javadoc

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9352 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c