Introduce Tumugi::Plugin::CommandBase class

[hakobera]

to easy to implement CLI based task like followings.

class AwesomeCLITask < Tumugi::Plugin::CommandBase
  param :param1

  def run
    run_command(command)
  end
  
  def command
     # return awesome CLI command
     "awesome-cli #{param1}"
  end
end

[hakobera]

@lamanotrama What do you think of this change? Is this worth for you?

[lamanotrama]

@hakobera Good!!