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This commit is targeted at solving tokio-rs/tokio-core#12 and incorporates the solution from tokio-rs/tokio-core#17. Namely the `need_read` and `need_write` functions on `PollEvented` now return an error when the connected reactor has gone away and the task cannot be blocked. This will typically naturally translate to errors being returned by various connected I/O objects and should help tear down the world in a clean-ish fashion.