Use `model_name` instead of inferring it from class name
Use `model_name` instead of inferring it from class name

This allows the use of decorator pattern in views.

artdevil/x-editable-rails,werein/x-editable-rails,werein/x-editable-rails,mattslack/x-editable-rails,mattslack/x-editable-rails,artdevil/x-editable-rails,neonix20b/x-editable-rails,neonix20b/x-editable-rails