Loose-ends wrapup

[Brian Goetz]

> Streams -- lingering feature ideas
>
>   - Additional tweaking on range generators (see Paul's emails)
>   - Convenience ints() and longs() generator methods?  (ditto)
>   - Collector for frequency counting?
>   - Support for state-based cancelation (e.g., cancelWhen(BooleanSupplier))
>   - Support for content-based limiting (takeWhile, skipUntil)
>   - Convenience methods like toList() on Stream

Plus:
  - Moving stream() / parallelStream() to Iterable