Add routine model, migration, seeds, and tests
Add rules to routine and tests
Remove unused helper function
Modify blueprints/fixtures and effected tests
Add exercise model, migration, seed, blueprint, tests, and associations
Add workout model, migration, seed, blueprint, tests, and associations
Add association tests for routine
Add exercise log model, migration, seed, blueprint, tests, and associations
Add weight log model, migration, seed, blueprint, tests, and associations
Merge branch 'workout'