def _parse!
      
      begin
        self.parser.parse!(self.argv)
      rescue
        puts self.parser.help
        exit 1
      end
      
      @symbology = self.argv.shift
      @target = self.argv.shift
    end
def _parse!
      
      begin
        self.parser.parse!(self.argv)
      rescue
        puts self.parser.help
        exit 1
      end
      
      @symbology = self.argv.shift
      @target = self.argv.shift
    end
Parses the command line arguments