Hypothesis

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This contains no functionality changes but fixes a mistake made with
building the previous package that would have broken installation on
Windows.

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Bugs fixed:

* When a call to floats() had endpoints which were not floats but merely
convertible to one (e.g. integers), these would be included in the generated
data which would cause it to generate non-floats.
* Splitting lambdas used in the definition of flatmap, map or filter over
multiple lines would break the repr, which would in turn break their usage.

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"Falsifying example" would not have been printed when the failure came from an
explicit example.

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Another small bugfix release:

* When using ForkingTestCase you would usually not get the falsifying example
printed if the process exited abnormally (e.g. due to os._exit).
* Improvements to the distribution of characters when using text() with a
default alphabet. In particular produces a better distribution of ascii and
whitespace in the alphabet.

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This is a small release that contains a workaround for people who have
bad reprs returning non ascii text on Python 2.7. This is not a bug fix
for Hypothesis per se because that's not a thing that is actually supposed
to work, but Hypothesis leans more heavily on repr than is typical so it's
worth having a workaround for.

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New features:

* Much more sensible reprs for strategies, especially ones that come from
hypothesis.strategies. These should now have as reprs python code that
would produce the same strategy.
* lists() accepts a unique_by argument which forces the generated lists to be
only contain elements unique according to some function key (which must
return a hashable value).
* Better error messages from flaky tests to help you debug things.

Mostly invisible implementation details that may result in finding new bugs
in your code:

* Sets and dictionary generation should now produce a better range of results.
* floats with bounds now focus more on 'critical values', trying to produce
values at edge cases.
* flatmap should now have better simplification for complicated cases, as well
as generally being (I hope) more reliable.

Bug fixes:

* You could not previously use assume() if you were using the forking executor.