Use ActiveJob instead of Resque directly

This allows us to directly pass entities to the job.

app/jobs/application_job.rb

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+class ApplicationJob < ActiveJob::Base
+end

app/jobs/notify_finished_order_job.rb

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+class NotifyFinishedOrderJob < ApplicationJob
+  def perform(order)
+    order.group_orders.each do |group_order|
+      next unless group_order.ordergroup
+
+      group_order.ordergroup.users.each do |user|
+        next unless user.settings.notify['order_finished']
+
+        Mailer.deliver_now_with_user_locale user do
+          Mailer.order_result(user, group_order)
+        end
+      end
+    end
+  end
+end

app/jobs/notify_negative_balance_job.rb

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+class NotifyNegativeBalanceJob < ApplicationJob
+  def perform(ordergroup, transaction)
+    ordergroup.users.each do |user|
+      next unless user.settings.notify['negative_balance']
+
+      Mailer.deliver_now_with_user_locale user do
+        Mailer.negative_balance(user, transaction)
+      end
+    end
+  end
+end

app/jobs/notify_received_order_job.rb

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+class NotifyReceivedOrderJob < ApplicationJob
+  def perform(order)
+    order.group_orders.each do |group_order|
+      next unless group_order.ordergroup
+
+      group_order.ordergroup.users.each do |user|
+        next unless user.settings.notify['order_received']
+
+        Mailer.deliver_now_with_user_locale user do
+          Mailer.order_received(user, group_order)
+        end
+      end
+    end
+  end
+end