Hypothesis

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This is a bug fix release for :issue:`514` - Hypothesis would continue running
examples after a :class:`~python:unittest.SkipTest` exception was raised,
including printing a falsifying example. Skip exceptions from the standard
:mod:`python:unittest` module, and ``pytest``, ``nose``, or ``unittest2``
modules now abort the test immediately without printing output.

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This release has two major aspects to it: The first is the introduction of
:func:`~hypothesis.strategies.deferred`, which allows more natural definition
of recursive (including mutually recursive) strategies.

The second is a number of engine changes designed to support this sort of
strategy better. These should have a knock-on effect of also improving the
performance of any existing strategies that currently generate a lot of data
or involve heavy nesting by reducing their typical example size.

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This release makes some major internal changes to how Hypothesis represents
data internally, as a prelude to some major engine changes that should improve
data quality. There are no API changes, but it's a significant enough internal
change that a minor version bump seemed warranted.

User facing impact should be fairly mild, but includes:

* All existing examples in the database will probably be invalidated. Hypothesis
handles this automatically, so you don't need to do anything, but if you see
all your examples disappear that's why.
* Almost all data distributions have changed significantly. Possibly for the better,
possibly for the worse. This may result in new bugs being found, but it may
also result in Hypothesis being unable to find bugs it previously did.
* Data generation may be somewhat faster if your existing bottleneck was in
draw_bytes (which is often the case for large examples).
* Shrinking will probably be slower, possibly significantly.

If you notice any effects you consider to be a significant regression, please
open an issue about them.

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This release involves no functionality changes, but is the first to ship wheels
as well as an sdist.

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This release provides a performance improvement to shrinking. For cases where
there is some non-trivial "boundary" value (e.g. the bug happens for all values
greater than some other value), shrinking should now be substantially faster.
Other types of bug will likely see improvements too.

This may also result in some changes to the quality of the final examples - it
may sometimes be better, but is more likely to get slightly worse in some edge
cases. If you see any examples where this happens in practice, please report
them.

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This is a bugfix release: Hypothesis now prints explicit examples when
running in verbose mode. (:issue:`313`)