Rollup merge of #40864 - steveklabnik:update-submodules, r=nrc

Update various book modules

This includes an important fix for rustc contributors in
https://github.com/rust-lang/book/pull/571

I'm going to update the other ones as well here while we're at it; no
need to spam PRs.

r? @nrc
This commit is contained in:
Corey Farwell 2017-03-28 23:19:25 -04:00 committed by GitHub
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