Add activeIndex to MegaMenu

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10398 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Initiated frozen columns feature for datatable, lot of work pending.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10399 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c