Fixed header-footer option of PrimeUI TreeTable

git-svn-id: http://primefaces.googlecode.com/svn/primeui/trunk/src/main/webapp@11501 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fixed treetable expand-collapse issue

git-svn-id: http://primefaces.googlecode.com/svn/primeui/trunk/src/main/webapp@11502 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Demo update

git-svn-id: http://primefaces.googlecode.com/svn/primeui/trunk/src/main/webapp@11503 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c