Rewrite

## From site project to reusable app
This pull request converts this repo from a full django project to a django reusable app. The thinking was to keep complexity down and focus on retrieving and cleaning the data. The app includes an admin with all the models wired up to inspect and sort. Future features will include a customized admin to for the backend.

For now, this marks a change in focus in the repo as discussed in #21. The entire campaign finance dashboard has been moved to the new [django-calaccess-browser](https://github.com/california-civic-data-coalition/django-calaccess-browser) repo.