Contextmenu improvements

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10157 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fixed checkbox handling

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10158 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Bootstrap fix

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10159 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Improve contextmenu event on tree

git-svn-id: https://primefaces.googlecode.com/svn/primefaces/trunk@10161 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c