ngMessages is a directive that is designed to show and hide messages based on the state of a key/value object that it listens on. The directive itself complements error message reporting with the ngModel $error object (which stores a key/value state of validation errors).
ngMessagesInclude is a directive with the purpose to import existing ngMessage template code from a remote template and place the downloaded template code into the exact spot that the ngMessagesInclude directive is placed within the ngMessages container. This allows for a series of pre-defined messages
