def register_page(name, options = {}, &block)
      ns = options.fetch(:namespace) { default_namespace }
      namespace(ns).register_page name, options, &block
    end
def register_page(name, options = {}, &block)
      ns = options.fetch(:namespace) { default_namespace }
      namespace(ns).register_page name, options, &block
    end
Register a page

 @param name [String] The page name
 @option [Hash] Accepts option :namespace.
 @&block The registration block.