Pushed some code at jacobemerick/comment-service.
- f47487c Sets up tests for NotificationHandler::__invoke.
- 4ed0fc9 Changes signature of notification handler to inject model, not pdo.
- bea7435 Fix for template parameters - list only likes numerical arrays.
- d7db970 Adds first few invoke test around recipient list.
- 1f30709 Adds test around the start of the mail object configuration.
- 85c5af1 Adds tests around recipient handling.
