Auto merge of #4561 - nossralf:uninstall-many, r=matklad
authorbors <bors@rust-lang.org>
Mon, 30 Oct 2017 19:58:01 +0000 (19:58 +0000)
committerbors <bors@rust-lang.org>
Mon, 30 Oct 2017 19:58:01 +0000 (19:58 +0000)
Support uninstallation of multiple packages

This is a WIP pull request with support for uninstalling multiple packages. It mirrors the logic used for `cargo install`.

Fixes #4560


Trivial merge