Work in Progress: Reply By Email:

- Add support classes and settings to enable reply by email
- Split out Email builder to be more OO, add many specs

db/migrate/20130610201033_add_reply_key_to_email_logs.rb

@@ -0,0 +1,6 @@
+class AddReplyKeyToEmailLogs < ActiveRecord::Migration
+  def change
+    add_column :email_logs, :reply_key, :string, limit: 32
+    add_index :email_logs, :reply_key
+  end
+end