Add cargo test --doc

[alexcrichton]

Supports testing only the documentation (like --lib, --bin, etc).

[brson]

@bors r+

[bors]

📌 Commit a63c642 has been approved by brson

[bors]

⌛ Testing commit a63c642 with merge 40fbeea...

[bors]

💔 Test failed - cargo-mac-64

[alexcrichton]

@bors: retry

On Wed, Apr 20, 2016 at 11:51 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - cargo-mac-64
http://buildbot.rust-lang.org/builders/cargo-mac-64/builds/1567

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#2578 (comment)

[bors]

⌛ Testing commit a63c642 with merge 09c0887...

[bors]

💔 Test failed - cargo-win-msvc-64

[alexcrichton]

@bors: retry

On Thu, Apr 21, 2016 at 10:52 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - cargo-win-msvc-64
http://buildbot.rust-lang.org/builders/cargo-win-msvc-64/builds/410

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#2578 (comment)

[bors]

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

[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