Build out section and chapter api endpoints
Update ember to talk to rails
Add flash messages to engine
Display an actual chapter on classroom load
Scope chapters/sections to the current registration code
Remove unused api controller
Expose chapters to the api
Remove legacy active admin tables

This was hacked into the parent app, so I needed to modify a previous migration.
You might need to rake db:schema:load to get it working.
Merge branch 'classroom_api'
Load training app registrations in app.js