Merge branch 'master' of https://github.com/tootsuite/mastodon

# Conflicts:
#	app/controllers/settings/exports_controller.rb
#	app/models/media_attachment.rb
#	app/models/status.rb
#	app/views/about/show.html.haml
#	docker_entrypoint.sh
#	spec/views/about/show.html.haml_spec.rb

app/controllers/auth/sessions_controller.rb

@@ -11,6 +11,15 @@ class Auth::SessionsController < Devise::SessionsController
   prepend_before_action :set_pack
   before_action :set_instance_presenter, only: [:new]
 
+  def new
+    Devise.omniauth_configs.each do |provider, config|
+      if config.strategy.redirect_at_sign_in
+        return redirect_to(omniauth_authorize_path(resource_name, provider))
+      end
+    end
+    super
+  end
+
   def create
     super do |resource|
       remember_me(resource)