Pytest-play

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- Nothing changed yet.

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Bugfix:

- fix compatibility with pytest 4.6. Rif 86

Documentation:

- update media section (articles and talks)

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Features and improvements:

- ``wait_until`` and ``wait_until_not`` now accept commands with no ``sub_commands`` property

- implement new ``while`` command in python provider (while expression is true)

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Minor changes:

- remove internal property parameter on engine

Bugfix:

- add compatibility with ``pytest-repeat``'s ``--count`` command line option

Documentation:

- mention how to generate dynamic values using ``{! expr !}`` expressions
(e.g., dynamic payloads in REST or MQTT without having to store variables
when not needed)

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Minor changes:

- add ``int`` and ``float`` builtins available in Python expressions

- make python expressions more flexible for future improvements (internal change that doesn't
affect compatibility)

Bugfix:

- fix ``--setup-plan`` invokation

Documentation:

- add more examples (bzt/Taurus and performance tests using pytest-play)

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- ``statsd`` integration (optional requirement) for advanced test metrics using statsd/graphite.
If you install pytest play with the optional statsd support with ``pytest-play[statsd]``
you will get the additional dependency ``statsd`` client and you can use the same cli
options defined by the ``pytest-statsd`` plugin (e.g.,
``--stats-d [--stats-prefix myproject --stats-host http://myserver.com --stats-port 3000]``).

Note well: despite the above cli options are the same defined by the ``pytest-statsd`` plugin,
at this time of writing ``pytest-statsd`` is not a ``pytest-play`` dependency
so you won't get stats about number of failures, passing, etc but only stats tracked by
``pytest-play``. If you need them you can install ``pytest-statsd`` (it plays well with ``pytest-play``)