Auto merge of #2876 - bennofs:fix-2851, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 14 Jul 2016 17:45:51 +0000 (10:45 -0700)
committerGitHub <noreply@github.com>
Thu, 14 Jul 2016 17:45:51 +0000 (10:45 -0700)
allow enabling features for deps with --features

Fixes #2851


Trivial merge