Merge branch 'master' into feature-tag

.gitlab-ci.yml

Gemfile

Gemfile.lock

app/controllers/application_controller.rb

app/controllers/concerns/paginator.rb

app/controllers/v1/activities_controller.rb

app/controllers/v1/learning_objects_controller.rb

app/controllers/v1/reviews_controller.rb

app/controllers/v1/roles_controller.rb

app/controllers/v1/search_controller.rb

app/models/bookmark.rb

app/models/collection.rb

app/models/complaint.rb

app/models/concerns/stateful.rb

app/models/concerns/trackable.rb

app/models/download.rb

app/models/follow.rb

app/models/institution.rb

app/models/learning_object.rb

app/models/like.rb