Add brainstem
Add brainstem config/directories
Add basic workout presenter
Add basic workout controller
Fix workout 'date' order
Add basic exercise presenter
Add basic exercise controller
Fix default sort orders
Test basic workout serialization
Re-arrange/factor workouts controller test
Switch default sort order to ascending
Change assertion order
Add workout fixtures
Filter workouts based on date
Add exercise fixture
Change default sort order name
Serialize all exercises
Serialize exercises for workout
Add exercise fixture
Add order to all test requests