Auto merge of #3515 - sdroege:doc-all, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 9 Jan 2017 21:46:23 +0000 (21:46 +0000)
committerbors <bors@rust-lang.org>
Mon, 9 Jan 2017 21:46:23 +0000 (21:46 +0000)
 Add support for documenting all members of the workspace with "doc --all"

https://github.com/rust-lang/cargo/issues/3491


Trivial merge