[wing] Non-fast-forward update to branch wip/poll-stream

[Ignacio Casal Quinteiro <icq src gnome org>]

The branch 'wip/poll-stream' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  e32de8f... Add WingInput/OutputStream classes
  e934ec3... inputstream: rework to implement read_async
  162fb0e... outputstream: implement write_async instead of pollable
  1fcf47b... fixes
  b21b017... more fixes
  e11aee5... Another c&p
  6efebbe... missing ;
  e1f9ac8... fix
  da1cacf... do not leak task
  be8ecb8... Fix test

Commits added to the branch:

  dc2b413... Add WingInput/OutputStream classes