def find_task_group(name)
      @task_groups[name].tap do |block|
        raise Exceptions::TaskGroupNotFound.new(name) unless block
      end
    end
def find_task_group(name)
      @task_groups[name].tap do |block|
        raise Exceptions::TaskGroupNotFound.new(name) unless block
      end
    end
Gets a task group of the given name