Add records app

[mjtamlyn]

Initially, just make it possible to track scores and visible only to admins. Then also make it possible for users to track their own scores (but not other people's).

References:

• Round models from scoring site: https://github.com/mjtamlyn/archery-scoring/blob/master/core/models.py#L65-L86 (ideally we don't actually want models though, it's not like these change that often!)
• http://www.archeryscorepad.com