Done with Chapters 8 and 9 in the book. Posts have dates.

And it didn't even take much. Woohoo!

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Completed "Sorting and Limiting Posts".

In the book, [Section 10](http://objectsonrails.com/#sec-10) is a fairly
straightforward bit about adding sorting and pagination (actually,
limiting) to the posts in a blog. Our code adapts that in two ways:

1. We use an attribute of the `Blog` class to specify how many posts the
   `#entries` method should return. That attribute is whitelisted by a
   *protected* `attr_reader` declaration.
2. The spec proving that entries are sorted in reverse chronological
   order no longer makes use of date literals as specified in the book,
   as that can (and did) lead to excessive time spent finding typos that
   spoil the sorting. Rather, we make use of the Chronic gem (see its
   [Github page](https://github.com/mojombo/chronic)), which allows us
   to specify "dates" like "two months ago" or "yesterday". Given that
   Avdi has at least two other books that pound people around the head
   with "don't use magic constants", the reliance on stringified dates
   in the original here is odd.

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