Re: [streams] ReadableStream.getReader name is a bit misleading (#308)

@domenic Thanks for the context! Intuitively, I would have thought that one would construct a reader and compose in a stream that the reader would operate on.   i.e. :
```js
const reader = new StreamReader(stream);
reader.read();    // the reader would do something stream.lock() and stream.release() internally
```
it seems a little off for the stream to have to know how to dole out readers....and if it didn't, the issue of naming 'getReader' would be a moot point  :smile:   Take this with a grain of salt as I've just started to read your spec.

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