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Improve error handling for read-only applications (#709)

Applications pending approval will return a different response body than what is presently supported.

Below is a copy of the actual response that comes back in this scenario:
```
{"status":401,"rateLimitTimeout":null,"body":{"request":"/1.1/statuses/update.json","error":"Read-only application cannot POST."}}
```

Whereas the current implementation assumes the presence of an `errors` array, reading off the first element (i.e. `result.body.errors[0]`), the above scenario throws an exception as `result.body.errors` is now `undefined` and cannot be indexed).

The proposed update seeks to account for this while retaining existing functionality and has been tested (error message in debug now properly says "Read-only application cannot POST."

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