add cucumber for integration testing and add a feature for statistics

refactor some stuff to support testing statistisc

features/support/paths.rb

@@ -0,0 +1,22 @@
+module NavigationHelpers
+  def path_to(page_name)
+    case page_name
+    
+    when /the homepage/
+      root_path
+    when /the statistics page/
+      stats_path
+    
+    # Add more page name => path mappings here
+    
+    else
+      raise "Can't find mapping from \"#{page_name}\" to a path.\n" +
+        "Now, go and add a mapping in features/support/paths.rb"
+    end
+  end
+end
+
+World do |world|
+  world.extend NavigationHelpers
+  world
+end