Added options for key width, chart width, and key justification.

[matthewlmcclure]

$ bar_chart.py --help
Usage: cat data | bar_chart.py [options]

Options:
  -h, --help            show this help message and exit
  -k, --sort-keys       sort by the key [default]
  -v, --sort-values     sort by the frequence
  -r, --reverse-sort    reverse the sort
  -j JUSTIFICATION, --justification=JUSTIFICATION
                        output justification of keys [right]
  -l KEY_LENGTH, --key-length=KEY_LENGTH
                        output length of keys [50]
  -w WIDTH, --width=WIDTH
                        output width of chart [80]

[indera]

It looks like the maintainer are busy... :(