email: wip add composer, mustache, swiftmailer.

* Email class.
* Email helper class.
email: wip Twig templates and SwiftMailer

* Removed mustache, no longer used.
* Tests for signup content with validation key.
* Mock swift mailer.
email: wip Pass in userModel instead of id.  Tweak email server settings.
email: Fix sf.php

* Add composer auto load
Merge branch 'feature/email'