Models now load with autoload instead of require
Courses have_many objectives
Began update of Objectives spec from autonomous to nested resource.
POST /objectives moved to POST /courses/:course_id/objectives

Returning status code 200
POST /courses/:course_id/objectives inserts an objective into the database (spec only)
POST /courses/:course_id/objectives should relate the new objective to the specified course
POST /courses/:course_id/objectives should return id of new objective
POST /courses/:course_id/objectives should return 400 if no such course
Setting up objectives specs for a few other tests that aren't implemented yet
POST /courses/:course_id/objectives is passing some more specs

Not the most modular commit, but oh well.
POST /courses/:course_id/objectives returns 400 if no objective data
Adding an objective to a course returns 401 if invalid data
Objectives controller is specced & passing