Make rake_tasks stub a class method

Author: hopsoft

test/rails_kit/stub.rb

@@ -20,11 +20,11 @@ def logger
   end
 
   class Railtie
-    def initialize(...)
+    def self.rake_tasks
+      []
     end
 
-    def rake_tasks
-      []
+    def initialize(...)
     end
   end
 end