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Tackle both #8 and #13 about std::size_t

Merged GILLES Sebastien requested to merge sgilles/gettingstartedwithmoderncpp:size_t into master

@steff and @vrouvrea (and of course @vicente.mataix if you wish but this MR follows remarks from Laurent and Vincent) if you can have a look at this very limited MR. Thanks!

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