def render_navigation(options = {}, &block)
      container = active_navigation_item_container(options, &block)
      container && container.render(options)
    end
def render_navigation(options = {}, &block)
      container = active_navigation_item_container(options, &block)
      container && container.render(options)
    end
Renders the navigation according to the specified options-hash.

 The following options are supported:
 * <tt>:level</tt> - defaults to :all which renders the the sub_navigation
   for an active primary_navigation inside that active
   primary_navigation item.
   Specify a specific level to only render that level of navigation
   (e.g. level: 1 for primary_navigation, etc).
   Specifiy a Range of levels to render only those specific levels
   (e.g. level: 1..2 to render both your first and second levels, maybe
   you want to render your third level somewhere else on the page)
 * <tt>:expand_all</tt> - defaults to false. If set to true the all
   specified levels will be rendered as a fully expanded
   tree (always open). This is useful for javascript menus like Superfish.
 * <tt>:context</tt> - specifies the context for which you would render
   the navigation. Defaults to :default which loads the default
   navigation.rb (i.e. config/navigation.rb).
   If you specify a context then the plugin tries to load the configuration
   file for that context, e.g. if you call
   <tt>render_navigation(context: :admin)</tt> the file
   config/admin_navigation.rb will be loaded and used for rendering
   the navigation.
 * <tt>:items</tt> - you can specify the items directly (e.g. if items are
   dynamically generated from database).
   See SimpleNavigation::ItemsProvider for documentation on what to
   provide as items.
 * <tt>:renderer</tt> - specify the renderer to be used for rendering the
   navigation. Either provide the Class or a symbol matching a registered
   renderer. Defaults to :list (html list renderer).

 Instead of using the <tt>:items</tt> option, a block can be passed to
 specify the items dynamically

 ==== Examples
   render_navigation do |menu|
     menu.item :posts, "Posts", posts_path
   end