Re: [streams] Merge ReadableByteStream into ReadableStream (#418)

It's time to do section reorganization previously suggested/investigated by @domenic at https://github.com/whatwg/streams/pull/418#issuecomment-171822826.

In addition to the idea by Domenic, can we separate internal operations and ones can be used directly by clients of each class? Too much?

For example, `InitializeReadableStreamReaderGeneric()` is just common code factored out from the two readers. Not indented for use by clients like `ReadFromReadableStreamReader()`.

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