Linked Location to Hubs, added location_id to Hubs, and renamed Hub.name to Hub.group.

Migrated and tested. Seemed to work for me. Please test, as I changed many files referencing Hub.name. Final schema looks like this:

![Location on Hubs](https://f.cloud.github.com/assets/2165336/55109/e628ddb2-5ab3-11e2-9540-9646108326f0.png)