Backport accepted PRs to beta#26700

Merged

brson merged 3 commits intorust-lang:betafrom

alexcrichton:beta-backport

Jul 6, 2015

Commits on Jul 1, 2015

Make `align_of` behave like `min_align_of`.

huonw
authored and
alexcrichton
committed
Avoid overflow in Vec::from_iter

sfackler
authored and
alexcrichton
committed
core: fix deprecation since version of align_of_min.

huonw
authored and
alexcrichton
committed