SparkPost / ruby-sparkpost / 157

100%

Pull #45

travis-ci

Improve DeliveryException

The sparkpost api returns errors in the following format:
```
{
  "errors": [
    {
      "message": "Message generation rejected",
      "description": "recipient address suppressed due to customer policy",
      "code": "1902"
    }
  ]
...
}

```

`message`, `description`, and `code` are now available on the
DeliveryException instance as: `service_message`,
`service_description`, `service_code`

The original message is preserved so it will not break any legacy
parsing written by users.

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