Avoid load tasks from plugins recursively (so stuff in tests or vendor does not get loaded).

railties/lib/rails/plugin.rb

@@ -27,7 +27,7 @@ def load_paths
     end
 
     def load_tasks
-      Dir["#{path}/**/tasks/**/*.rake"].sort.each { |ext| load ext }
+      Dir["#{path}/{tasks,lib/tasks,rails/tasks}/**/*.rake"].sort.each { |ext| load ext }
     end
 
     initializer :add_to_load_path, :after => :set_autoload_paths do |app|