Disambiguate the model names automatically imported by shell_plus
Disambiguate the model names automatically imported by shell_plus

./manage.py shell_plus, from django-extensions, is very useful and a
great time-saver, but there are plenty of model name collisions among
all the Django applications used by Pombola - this commit uses the
SHELL_PLUS_APP_PREFIXES setting to disambiguate those, adding a prefix
to the generally less commonly used application.

mysociety/pombola,mysociety/pombola,mysociety/pombola,mysociety/pombola,mysociety/pombola,mysociety/pombola