Change email confirmation

- New endpoint to send a user an email to verify the email address when they want to change it.

config.py

@@ -64,6 +64,7 @@ class Config(object):
     EMAIL_VERIFY_CODE_TEMPLATE_ID = 'ece42649-22a8-4d06-b87f-d52d5d3f0a27'
     PASSWORD_RESET_TEMPLATE_ID = '474e9242-823b-4f99-813d-ed392e7f1201'
     ALREADY_REGISTERED_EMAIL_TEMPLATE_ID = '0880fbb1-a0c6-46f0-9a8e-36c986381ceb'
+    CHANGE_EMAIL_CONFIRMATION_TEMPLATE_ID = 'eb4d9930-87ab-4aef-9bce-786762687884'
 
     BROKER_URL = 'sqs://'
     BROKER_TRANSPORT_OPTIONS = {