Retrieving Course Name from Course API

@dsjen @rocha
We've been trying to avoid using "id" to talk about CourseKey objects. This should probably be `course.key` and `course.name`.

IIRC we use course_id when we are talking about a string (generally) and course_key when the string has been parsed and we have a proper object.

@rocha correct me if I misunderstood the state of affairs here