parse should make it easier to turn off static configuration

Task.parse automatically performs static configuration from app.config_filepath(name). The feature is effectively turned off by specifying no name or a non-existant name, but there should be an easier way not only from ARGV but programatically (for instance as an option)

  def parse(argv=ARGV, app=Tap::App.instance, :static_config_file => false)
  end