Changes supporting feature brach SKILL-3
Add migration for courses

Add schema for courses table

Add first spec for course

Add course model

Add validation to not allow duplicate course names

Add uniqueness validation to Course model

Add route for course show

Add FactoryGirl factory for courses

Add spec for GET show on CoursesController

Add controller for courses. Show method

Newline at EOF

Add ApiController

Change CoursesController base class

Make courses factory simpler

Remove CourseController spec
Change base class for StudentsController to ApiController
Merge pull request #8 from lukezbikowski/ps-skill-3-course

SKILL-3: As a guest I can receive course details by id