Add basic url routes for model testing.
Clean up models

Some of the foreign keys should be switched to ManytoMany keys.

Team <-> Character, Team <-> Player, Competition <-> Team are all good
candidates. I want to ensure the API I define is as easy to use as possible.
Add basic view functions for select models.

Six basic view functions for testing templates and models have been added to the
diesel app. These seem repetitive, I should look into simplying the basic case.