Refactor tree keyboard

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@12102 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Better positioning for tooltip

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@12103 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
fixed PrimeFaces.isIE

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@12104 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c