Auto merge of #56118 - steveklabnik:update-books, r=alexcrichton

Update books for Rust 2018

This PR:

1. updates all of the books
    * I don't know if @Gankro has further plans for the nomicon or not
2. updates the build process because TRPL is only distributing one edition now
3. fixes up the stdlib links

I think that this passes but it's 3:20 am and so I'm sending it in and will fix up anything i missed in the morning.

/cc @alexcrichton for the big beta backport