[#4604] Add an admin panel for the rate caches

app/controllers/rate_caches_controller.rb

@@ -0,0 +1,10 @@
+class RateCachesController < ApplicationController
+  unloadable
+
+  layout 'admin'
+  
+  before_filter :require_admin
+
+  def index
+  end
+end

app/views/rate_caches/index.html.erb

@@ -0,0 +1 @@
+<h2><%= l(:text_rate_caches_panel) %></h2>