fix for being able to execute context_menu action by keyboard (space and enter)
fix for being able to execute context_menu action by keyboard (space and enter)

I think it is broken while fixing issue #706.

duzun/jstree,duzun/jstree,Project-TF/jstree,iCasa/jstree,codio/jstree,Project-TF/jstree,vakata/jstree,vakata/jstree,codio/jstree,iCasa/jstree,iCasa/jstree