fixes #4927. Added isFocusable(){return false;} to MenuSeparator and ToolbarSeparator widgets.  In _onContainerFocus in _container.js check for isFocusable before updating this.lastFocused.  Prevents error in Menu code.  Needs a more thorough fix for 1.1 -submitted #4933 to cover that. 
fixes #4927. Added isFocusable(){return false;} to MenuSeparator and ToolbarSeparator widgets.  In _onContainerFocus in _container.js check for isFocusable before updating this.lastFocused.  Prevents error in Menu code.  Needs a more thorough fix for 1.1 -submitted #4933 to cover that. 

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@11189 560b804f-0ae3-0310-86f3-f6aa0a117693

kitsonk/delite,harbalk/delite,Sam-Cummins/delite,kitsonk/delite,Sam-Cummins/delite,harbalk/delite