Fixed TreeTable emptyMessage bug causing invalid html when emptyFacet is used, also fixed css class name.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8912 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
CSS selector rename to follow our conventions.

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8913 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bug fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8915 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bug fix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8916 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Changed to UIMenuItem

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8918 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Changed to MenuItem

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8919 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c