Auto merge of servo#173 - servo:profiling, r=emilio

Add a cargo feature for profiling.

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Auto merge of servo#150 - CYBAI:getpromiseishandled, r=jdm

Support to get PromiseIsHandled internal slot in Promise

When trying to implement unhandled rejection in servo/servo#20755, I'd need to check the internal slot of Promise which is the step 4.1.1 for the spec of [notify about rejected promises](https://html.spec.whatwg.org/multipage/webappapis.html#notify-about-rejected-promises).
So, this PR will add the API to add the `GetPromiseIsHandled` method.

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Merge pull request servo#147 from servo/align

Update bindgen and bump the minimum Rust version to 1.25

Auto merge of servo#146 - servo:build, r=jdm

Pass -stdlib=libc++ on Apple systems

```
/Users/nox/src/mozjs/target/debug/build/mozjs_sys-0b48e14e1603d6a2/out/dist/include/mozilla/Span.h:32:10: fatal error: 'array' file not found
```

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Auto merge of servo#143 - Eijebong:bindgen, r=asajeffrey

Update bindgen and bump version

Let's kill regex 0.2 !

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Auto merge of servo#45 - metajack:no-travis, r=metajack

Disable Travis CI since it can't handle mozjs.