fixed a minor typo in the help string of create_command.
fixed a minor typo in the help string of create_command.

tectronics/django-command-extensions,katakumpo/django-command-extensions,Dougoc/django-command-extensions,google-code-export/django-command-extensions,Dougoc/django-command-extensions,niceban/django-command-extensions,google-code-export/django-command-extensions,google-code-export/django-command-extensions,niceban/django-command-extensions,tectronics/django-command-extensions,katakumpo/django-command-extensions,Dougoc/django-command-extensions,niceban/django-command-extensions,katakumpo/django-command-extensions,tectronics/django-command-extensions