Add more spec for Resource model
- Make tests deterministic (use a fixed resource type rather than a random one)
- Add tests for resource_type (#webpage?, #image?, #video?, #paragraph?)
- Rename test for #compatibility_score (was #learner_compatibility_score)
Standarize to use String for resource_type + Rename #learner_compability_score to #compatibility_score
Merge branch 'add_resource_class_methods' into development