Re: [heycam/webidl] Sort out when dictionaries and records should have default values (#76)

Also, to the consistency argument:

Regardless of history, the semantics chosen are not POLA and seem internally inconsistent. E.g.:
```js
dictionary Foo { required long foo1; };
dictionary Bar { Foo myFoo = null; };

void doStuff(optional Bar myBar);
```
```js
Jib.doStuff(); // TypeError: Missing required 'foo1' member of Foo.
```
Note how we don't get “`Not enough arguments`” this time. Not only is our default allowed but ignored, if I remove the `optional` keyword, the compiler says:

WebIDL.WebIDLError: error: Dictionary argument without any required fields or union argument containing such dictionary not followed by a required argument must be optional, /Users/Jan/moz/mozilla-central/dom/webidl/Jib.webidl line 18:19
 0:05.91  void doStuff(Bar myBar);

So it *literally* says the argument to `doStuff` is optional, and the compiler agrees. None of that adds up to `foo1` (and therefore `myBar`) being required by `doStuff()`, not even the WebIDL spec.

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