unix: fix stream refcounting buglet

Fix a buglet where uv_read_stop() would mark the handle as stopped even
when there are in-progress write requests.

This bug is unlikely to have affected anyone, the only case where it
has a user-visible effect is when:

  a) the handle has been stopped for reading but not writing, and
  b) it's the last active handle in the event loop's pollset

If both conditions are met, it's possible for the event loop to
terminate prematurely.

This reapplies commit 80f2f82 which was temporarily reverted in fe7b154
because it was making a lot of node.js tests fail on OS X. The failures
turned out to be a bad assumption in uv__finish_close() which was been
rectified in this patch.

Conflicts:
	src/unix/stream.c