Cache improvements

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9316 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Removed unused import.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9317 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
#5705

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9318 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c