Consider renaming app to django_simple_deploy

[ehmatthes]

See discussion about consistency between package names and app names, ie django-polls and django_polls.

Quick thoughts

• This is definitely a pre-1.0 decision.
• Want to keep the command python manage.py simple_deploy --platform <platform>, not python manage.py django_simple_deploy --platform <platform>.
• I believe this can be done by only changing what's added to INSTALLED_APPS, not how the package is used on the CLI. Yes, the command name comes from the name of the file under simple_deploy/management/commands/.
• I don't believe that namespace conflicts are likely with this package, but nobody expects conflicts and there's great value in conforming to overall community conventions.

Tasks

• [x] Consider pros and cons, and implementation.
• [ ] Make appropriate changes to codebase.
• [ ] Test.
• [ ] Release.
• [ ] Announce.