Merge remote-tracking branch 'origin/master' into merge-upstream

Conflicts:
	.env.production.sample
	app/controllers/auth/confirmations_controller.rb
	db/schema.rb

db/migrate/20180204034416_create_identities.rb

@@ -0,0 +1,11 @@
+class CreateIdentities < ActiveRecord::Migration[5.0]
+  def change
+    create_table :identities do |t|
+      t.references :user, foreign_key: { on_delete: :cascade }
+      t.string :provider, null: false, default: ''
+      t.string :uid, null: false, default: ''
+
+      t.timestamps
+    end
+  end
+end