asyncio: sync with Tulip

- Tulip issue 185: Add a create_task() method to event loops. The create_task()
  method can be overriden in custom event loop to implement their own task
  class. For example, greenio and Pulsar projects use their own task class. The
  create_task() method is now preferred over creating directly task using the
  Task class.
- tests: fix a warning
- fix typo in the name of a test function
- Update AbstractEventLoop: add new event loop methods; update also the unit test

Update asyncio documentation

- Document the new create_task() method
- "Hide" the Task class: point to the create_task() method for interoperability
- Rewrite the documentation of the Task class
- Document the "Pending task destroyed"
- Update output in debug mode of examples in the dev section
- Replace Task() with create_task() in examples

- Document the new create_task() method
- "Hide" the Task class: point to the create_task() method for interoperability
- Rewrite the documentation of the Task class
- Document the "Pending task destroyed"
- Update output in debug mode of examples in the dev section
- Replace Task() with create_task() in examples

- Tulip issue 185: Add a create_task() method to event loops. The create_task()
  method can be overriden in custom event loop to implement their own task
  class. For example, greenio and Pulsar projects use their own task class. The
  create_task() method is now preferred over creating directly task using the
  Task class.
- tests: fix a warning
- fix typo in the name of a test function
- Update AbstractEventLoop: add new event loop methods; update also the unit test

ValueError if the number of received bytes is negative.

the number of received bytes is negative.

it doesn't get a bytes string

get a bytes string

PySys_FormatStderr() call

PySys_FormatStderr() call

requires size to be a Py_ssize_t, not an int. _ssl.c is now "Py_ssize_t clean".

size to be a Py_ssize_t, not an int. _ssl.c is now "Py_ssize_t clean".

Initial patch by Kathleen Weaver.

The user-facing scripts in PCbuild have been updated to be easier to use
and the buildbot scripts in Tools\buildbot have been updated to use the
user-facing scripts in PCbuild wherever possible.

Backout the "Tulip issue 181: Faster create_connection()" changeset, it was a
mistake.

Backout the "Tulip issue 181: Faster create_connection()" changeset, it was a
mistake.

- Tulip issue #181: Faster create_connection(). Call directly
  waiter.set_result() in the constructor of _ProactorBasePipeTransport and
  _SelectorSocketTransport, instead of using of delaying the call with
  call_soon().
- Cleanup iscoroutine()

- Tulip issue #181: Faster create_connection(). Call directly
  waiter.set_result() in the constructor of _ProactorBasePipeTransport and
  _SelectorSocketTransport, instead of using of delaying the call with
  call_soon().
- Cleanup iscoroutine()

representations (on mips and m68k platforms).

representations (on mips and m68k platforms).