'Case' the database model messes with ruby's case/when syntax

[madoleary]

Right now it's not possible to write 'case' in reference to the model without tripping over ruby's case/when syntax. If you write 'case' to declare a variable in reference to the case model, ruby expects the 'when' follow-up, and will throw an error. This will likely pose problems for object fabrication during unit tests, where, for example, a 'case' object ought to be nested inside of a point using the same name that it has in the database.