Feature: Conversation creation email notifications (#576)

* Clean up the mailers

* Disable assignment mailer if setting is turned off

* Email notifications on conversation create

* Specs

app/workers/conversation_reply_email_worker.rb

@@ -0,0 +1,15 @@
+class ConversationReplyEmailWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :mailers
+
+  def perform(conversation_id, queued_time)
+    @conversation = Conversation.find(conversation_id)
+
+    # send the email
+    ConversationReplyMailer.reply_with_summary(@conversation, queued_time).deliver_later
+
+    # delete the redis set from the first new message on the conversation
+    conversation_mail_key = Redis::Alfred::CONVERSATION_MAILER_KEY % @conversation.id
+    Redis::Alfred.delete(conversation_mail_key)
+  end
+end