Rename function settings.get_settings to get_module_globals
Rename function settings.get_settings to get_module_globals

The name `get_settings` sounds like something that might be used in
project code when this function is intended only for internal use in
`arcutils.settings`. The name `get_module_globals` is intended to make
this function less noticeable.

wylee/django-arcutils,PSU-OIT-ARC/django-arcutils,PSU-OIT-ARC/django-arcutils,wylee/django-arcutils