Change base object expectations

- Can except text/plain
- Child classes can pick data from content returned
- A 404 can happen with bad data and no JSON
Oops, fix the content type inspection to inspect content type
Refactor initial refactor of hockeyapp.app

- Use named tuples for return results from API calls with paginated results
- Split Applications out from Application
  - Application is initialized with app_id
- Add stub endpoints for anticipated API
- Most Crash endpoints working