Add filter_in_place to Vec and VecDeque#1353

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Amanieu wants to merge 2 commits intorust-lang:masterfrom

Amanieu:retain_mut

Commits on Feb 2, 2016

RFC to add retain_mut to Vec and VecDeque
Amanieu
committed

Commits on May 27, 2016

Rename retain_mut to filter_in_place, add filter_in_place_unordered and deprecate
Amanieu
committed