Remove unused routes
Write demo acceptance test
Update schema
Add a disabled attribute to chapter json

In ember we need to determine how to activate a chapter. demo == true or disabled = false
Only courses will be fetched from the api

We send down all sections and chapters associated with the course.
Add classroom resource

Demo courses will be at
/classroom/#/courses/1

registered courses will be at:
/classroom/#/courses/1?code=1234
Remove sections from Ember routes

Ember will care about courses/1/chapters/1
No need to respond to json in courses controller
Style disabled chapter links