Organize settings file, remove examples app, add temporary index.

Fixes the two small issues from #3: Being explicit about what apps/middleware/etc we're using instead of relying on funfactory's definitions, and moving the import statement in the settings.

I reorganized the settings file to mimic what we did with [Lumbergh](https://github.com/mozilla/lumbergh/), as my hope is that we'll use this schema in more and more projects. While I was in there, I removed some middlewares that we shouldn't need (django-mobility, some l10n stuff) that can be added back in later as necessary.

I also removed the examples app and locale directory, and added a small index page pointing to the RNA api page and admin interface. We can replace that later once we know what the non-API parts of this service should look like.