def root_to reference
      Router.set_root_to reference
      context = Context.collection[reference]
      context.routes[:root]= Route.new('/', context,{ context: reference})
    end
def root_to reference
      Router.set_root_to reference
      context = Context.collection[reference]
      context.routes[:root]= Route.new('/', context,{ context: reference})
    end
set the root context, this is the initial context that will be renered by the router

 @note there is only ever one root, calling this multiple times will over right the original root
 @param [Symbol] reference to context