bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11527 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
ColumnGroup support

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11528 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Remove unused import

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11529 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bug fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11530 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
regression fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11531 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Sort support

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11532 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c