All user/role management should happen within the extension

[rochoa]

Right now user/role management happens in several places, most of it in CartoDB/cartodb Rails application:

• creating user
• creating publicuser
• grant permissions on schemas
• creating schemas
• etc

The ideal scenario would be to have an API inside the extension to manage all those cases. That would help to remove the hard dependency on CartoDB/cartodb Rails application.

[rochoa]

One case that should be fixed by this: CartoDB/cartodb#5019