renderl rails helper, to make collections renderable with a layout

_boxed.html.haml

%div.box
  = yield

_line_item.html.haml

%tr{ :class => yield(:class), :id => yield(:id) }
  %td 
    = yield

_list_item.html.haml

%li{ :class => yield(:class), :id => yield(:id) }
  = yield :prepend
  = yield
  = yield :append

_tag.html.haml

- if link ||= false
  = link_to tag, tag
- else
  = tag

- content_for :class do
  = dom_class tag

application_helper.rb

module ApplicationHelper
  def renderl collection, layout, locals={}
    for e in collection do
      return render(:partial => e, :layout => layout, :locals => locals)
    end
  end
end

index.html.haml

- # usage:

= renderl @tags, 'boxed', :locals => {:foo => 'bar'}

%ul
  = renderl @tags, 'list_item', { :link => false }