[heycam/webidl] Exception cleanup (#250)

* Don't define simple exception names in WebIDL.
* Make Error exclusively for authors.
* Fix syntax for throwing and creating DomExceptions.
* Fix examples.

Closes #247.

**NOTE:** This doesn't address the distinction between [#throw](https://heycam.github.io/webidl/#dfn-throw) and [#ecmascript-throw](https://heycam.github.io/webidl/#ecmascript-throw), which I think needs fixing before we merge this.

I'd be tempted not to export [#ecmascript-throw](https://heycam.github.io/webidl/#ecmascript-throw) and make everything use [#throw](https://heycam.github.io/webidl/#dfn-throw) instead. (Currently all simple exceptions in the spec reference [#ecmascript-throw](https://heycam.github.io/webidl/#ecmascript-throw), which I don't think is the right thing to do.)
We'd then only use the text around [#ecmascript-throw](https://heycam.github.io/webidl/#ecmascript-throw) in the bindings to describe the behavior of all exceptions (or just simple ones?) in an ES environment. Thoughts?
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/250

-- Commit Summary --

  * Exception cleanup

-- File Changes --

    M index.bs (78)
    M index.html (194)

-- Patch Links --

https://github.com/heycam/webidl/pull/250.patch
https://github.com/heycam/webidl/pull/250.diff

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