Merge branch 'master' of gitlab.c3sl.ufpr.br:portalmec/portalmec

app/serializers/learning_object/attachment_serializer.rb

+class LearningObject::AttachmentSerializer < ActiveModel::Serializer
+  attributes :id, :name, :retrieve_link, :description, :format, :mime_type, :size, :bundle_name, :learning_object_id, :created_at, :updated_at, :id_dspace, :thumbnail, :cache_link
+end