Command line version not working

[jyapayne]

The command line version doesn't work and spits out this error:

Updating nw versions...
Done.
Traceback (most recent call last):
  File "command_line.py", line 1596, in <module>
    main()
  File "command_line.py", line 1584, in main
    args = get_arguments(command_base)
  File "command_line.py", line 1425, in get_arguments
    return parser.parse_args()
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1728, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1760, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1966, in _parse_known_args
    start_index = consume_optional(start_index)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1906, in consume_optional
    take_action(action, args, option_string)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1834, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 1016, in __call__
    parser.print_help()
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 2359, in print_help
    self._print_message(self.format_help(), file)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 2343, in format_help
    return formatter.format_help()
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 278, in format_help
    help = self._root_section.format_help()
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 208, in format_help
    func(*args)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 208, in format_help
    func(*args)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 515, in _format_action
    help_text = self._expand_help(action)
  File "/usr/local/Cellar/python3/3.4.3_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/argparse.py", line 602, in _expand_help
    return self._get_help_string(action) % params
ValueError: unsupported format character 'n' (0x6e) at index 135

This is due to adding "%" symbols in the documentation, which ArgParser complains about.