Improve autocompletion

[knight42]

1. Add path completion to manifest-path options
2. Support subcommand metadata

[rust-highfive]

r? @alexcrichton

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[alexcrichton]

@bors: r+ c7e2986

Thanks!

[bors]

⌛ Testing commit c7e2986 with merge d84d554...

[bors]

💔 Test failed - cargo-mac-32

[alexcrichton]

@bors: retry

On Mon, Jun 6, 2016 at 11:33 AM, bors notifications@github.com wrote:

💔 Test failed - cargo-mac-32
http://buildbot.rust-lang.org/builders/cargo-mac-32/builds/1652

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[bors]

⚡ Previous build results for cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64 are reusable. Rebuilding only cargo-mac-32...

[bors]

☀️ Test successful - cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64