NYT API has changed

[SJBertram]

One of the exercises (3rd edition) uses the NYT web API for fetching articles to analyse.

1. The URL for the API has changed (it is now v2 and at a slightly different path)
2. The API no longer seems to return body text, which greatly reduces its usefulness
3. Even where there are fields that could be useful (abstract, section name), they don't always appear to be included in the data

While it loses the "using an API" aspect, it would be helpful to provide a pre-canned data set to replace the exercise.