replace stub and mock deprecations with doubles

spec/controllers/admins_controller_spec.rb

spec/controllers/invitations_controller_spec.rb

spec/controllers/profiles_controller_spec.rb

spec/controllers/share_visibilities_controller_spec.rb

spec/helpers/interim_stream_hackiness_helper_spec.rb

spec/helpers/notifications_helper_spec.rb

spec/helpers/posts_helper_spec.rb

spec/integration/dispatching_spec.rb

spec/integration/receiving_spec.rb

spec/lib/account_deleter_spec.rb

spec/lib/configuration_methods_spec.rb

spec/lib/diaspora/federated/relayable_retraction_spec.rb

spec/lib/diaspora/federated/signed_retraction_spec.rb

spec/lib/email_inviter_spec.rb

spec/lib/hydra_wrapper_spec.rb

spec/lib/postzord/dispatcher_spec.rb

spec/lib/postzord/receiver/private_spec.rb

spec/lib/postzord/receiver/public_spec.rb

spec/lib/rake_helper_spec.rb

spec/lib/stream/aspect_spec.rb