Feature error endpoint

[campb303]

Created HTTPResponse resource with a get method that builds a list of HTTP response codes and messages from the http.HTTPStatus symbol and returns the requested response code and message or a 404 message if the requested response code is not found. Requesting a 404 directly will return the standard 404 message.

The HTTPResponse resource was added to the API path at /api/error/<int:response_code>.

Example:

# Start API
gunicorn webqueue2api.api:app

# Request 301 response
curl localhost:8000/api/error/301

// Expeted Output
{"message": "Moved Permanently"}