improved visuals

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@12019 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Check for existing role

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@12020 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Additional flags for sort and filter

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@12021 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Support for showCloseIcon

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@12022 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c