Monkey patch ammeter to fix issue with changes to delegate from Rails 4

spec/support/ammeter.rb

@@ -0,0 +1,19 @@
+require 'ammeter'
+# Rails 4 changes the implementation of delegate to no longer use send.  
+#Because of this it can no longer be used to delegate to a protected of another object as Ammeter attempts to do for prepare_destination
+#Monkey patch Ammeter to call send itself for perpare_destination when in Rails 4.
+#Needed until Ammeter fixes itself
+module Ammeter
+  module RSpec
+    module Rails
+      # Delegates to Rails::Generators::TestCase to work with RSpec.
+      module GeneratorExampleGroup
+        module ClassMethods
+          def prepare_destination
+            self.test_unit_test_case_delegate.send :prepare_destination
+          end
+        end
+      end
+    end
+  end
+end if ::Rails::VERSION::MAJOR == 4