Added aria-checked for selectBooleanCheckbox

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11904 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11905 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c