bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11580 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Attempt to support non-ascii in content disposition

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11581 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c