Bugfix: Private notes in emails & broken Signup (#1068)

* Bugfix: Private notes in emails

Private notes were sent in the emails as part of
conversation continuity. Fixed this issue.

Also made the changes to not even queue the mails
if message is a private note.

* Bugfix: Change issue with featurable in signup - passing array
* Bugfix: Added specs for checking  private notes being sent in email

app/models/concerns/featurable.rb

@@ -55,6 +55,6 @@ module Featurable
     return true if config.blank?
 
     features_to_enabled = config.value.select { |f| f[:enabled] }.map { |f| f[:name] }
-    enable_features(features_to_enabled)
+    enable_features(*features_to_enabled)
   end
 end

app/models/message.rb

@@ -146,7 +146,7 @@ class Message < ApplicationRecord
   end
 
   def notify_via_mail
-    if Redis::Alfred.get(conversation_mail_key).nil? && conversation.contact.email? && outgoing?
+    if Redis::Alfred.get(conversation_mail_key).nil? && conversation.contact.email? && outgoing? && !private
       # set a redis key for the conversation so that we don't need to send email for every
       # new message that comes in and we dont enque the delayed sidekiq job for every message
       Redis::Alfred.setex(conversation_mail_key, Time.zone.now)