Show the command line help

def show_command_line_usage(parser, usage=False):
    """ Show the command line help
    """
    help_header_message = get_command_header(parser, "command", usage)
    loader = template.Loader(os.path.join(
        firenado.conf.ROOT, 'management', 'templates', 'help'))
    command_template = "  {0.name:15}{0.description:40}"
    help_message = loader.load("main_command_help.txt").generate(
        command_categories=command_categories,
        command_template=command_template
    ).decode(sys.stdout.encoding)
    # TODO: This print has to go. Use proper stream instead(stdout or stderr)
    print(''.join([help_header_message, help_message]))