Rollup merge of #48404 - steveklabnik:second-edition-is-the-best-edition, r=QuietMisdreavus

Update the book to promote second edition

This updates the book repository, but mostly to include
https://github.com/rust-lang/book/pull/1180

TL;DR: the second edition is close enough to done that we should
universally recommend it over the first edition.
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Manish Goregaokar 2018-02-24 15:52:10 -08:00 committed by GitHub
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