It would fail if the length of bytes and unicode differs.

It now passes non-bytes to `Form` directly.

* py3 fixes for form handling in paste.fixture

It uses "not six.PY2" in contrast to other places in the code to be
forward-compatible.

I've not looked too closely, but it might make sense to decode body/text
in the beginning already, instead of having it as bytes internally?!

Also, like mentioned in [1] already, it should probably use the correct
source encoding?!

1: https://github.com/cdent/paste/blob/36e5b8bd16a6063ec654faf04541f3a20d19f7fe/paste/fixture.py#L820

* Add test, using/fixing SlowConsumer form app

* pytest: fix collection warnings via __test__=False

Fixes

> "cannot collect test class %r because it has a __init__ constructor

Ref: https://github.com/pytest-dev/pytest/issues/2007

* pytest: configure testpaths

This is faster with test collection.

* pytest: fix warning with doctests

Fixes

> /usr/lib/python3.7/site-packages/_pytest/python.py:764:
> RemovedInPytest4Warning: usage of Generator.Function is deprecated,
> please use pytest.Function instead

* Minor fixes around s/py.test/pytest/

Future is calling installation endless recursion. We are only
using it for an html.escape method, so we make our own and get
rid of future.

Related-Bug: #6

This is for the sake of getting something out there, including
fixes to get stuff working with Python 3.7.

Prepare docs for publishing to RTFD