Remove unnecessary 'login' action from register controller
Update from null_profile to user_profile
Create user object without profile

* It is ridiculous to ask for the child before the parent
* This way, we should just serialize to profile_type: null
Patch serializer for polymorphic null case

* Was failing for not being able to retrieve
* type key from null profile object, now if the
* relationship isn't set, the type should be null
Make disable rely on isValid
Improve fullName computed property
Model Validations
Rename model-validations model_validations_mixin
Add validations support to DS.Model
Remove debug alerts from model.js.coffee
Add potential flash implementation for registration errors
Make validations array look nicer
Clean up validation definitions a bit more
We have beautiful error management!!!
Add first_name and last_name to User ActiveModel
Add UsersController#create
Add active model serializers
Add user_serializer
User user_profile not profile in serializer
Add null profile