Hide description for restricted chapters
Build route and setup model
Move and update registrations controller
Setup stripe
Rename purchase to register
Add registration resource and remove chapter and sections
Build out client side registrations
Use lower case attr names
Clean up registration form
Add price to registration form
Remove errors on submit
Persist registration
Update Ember
Add flash notification after successful purchase
Save purchase in session
Fix session issues
Add discount codes
Fix bug when no chapters exist
Fix up admin
Update buy now links