[webidl-checker] Support for required dictionary member (#16)

The following idl doesn't pass.

```
dictionary FooDict {
    required boolean b;
};
```

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Reply to this email directly or view it on GitHub:
https://github.com/dontcallmedom/webidl-checker/issues/16

Received on Friday, 26 June 2015 11:25:59 UTC