Remove unused App#recent_requests_with_status method.
Consistent User spec formatting.
Remove comment about mocking ActiveRecord.

Justified in that mocking allows a consistent, reproducible effect.
The most important part, data integrity, is enforced by a database
constraint.

Closes #9
ApiV1::RequestsController spec cleanup.
Remove model validation specs.

These don't provide value and are exercised through integration.
Style; space between contexts.
Consistent validation formatting.
Remove unnecessary spec.