Hypothesis

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* Better argument validation for datetimes() strategy - previously setting
max_year < datetime.MIN_YEAR or min_year > datetime.MAX_YEAR would not have
raised an InvalidArgument error and instead would have behaved confusingly.
* Compatibility with being run on pytest < 2.7 (achieved by disabling the
plugin).

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Bug fixes:

* Settings(database=my_db) would not be correctly inherited when used as a
default setting, so that newly created settings would use the database_file
setting and create an SQLite example database.
* Settings.default.database = my_db would previously have raised an error and
now works.
* Timeout could sometimes be significantly exceeded if during simplification
there were a lot of examples tried that didn't trigger the bug.
* When loading a heavily simplified example using a basic() strategy from the
database this could cause Python to trigger a recursion error.
* Remove use of deprecated API in pytest plugin so as to not emit warning

Misc:

* hypothesis-pytest is now part of hypothesis core. This should have no
externally visible consequences, but you should update your dependencies to
remove hypothesis-pytest and depend on only Hypothesis.
* Better repr for hypothesis.extra.datetimes() strategies.
* Add .close() method to abstract base class for Backend (it was already present
in the main implementation).

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Bug fixes:

* When running Hypothesis tests in parallel (e.g. using pytest-xdist) there was a race
condition caused by code generation.
* Example databases are now cached per thread so as to not use sqlite connections from
multiple threads. This should make Hypothesis now entirely thread safe.
* floats() with only min_value or max_value set would have had a very bad distribution.
* Running on 3.5, Hypothesis would have emitted deprecation warnings because of use of
inspect.getargspec

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* text() with a non-string alphabet would have used the repr() of the the alphabet
instead of its contexts. This is obviously silly. It now works with any sequence
of things convertible to unicode strings.
* given will now work on methods whose definitions contains no explicit positional
arguments, only varargs (:issue:`118`).
This may have some knock on effects because it means that given no longer changes the
argspec of functions other than by adding defaults.
* Introduction of new composite feature for more natural definition of strategies you'd
previously have used flatmap for.

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Fix support for fixtures on Django 1.7.

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Tiny bug fix release:

* If the database_file setting is set to None, this would have resulted in
an error when running tests. Now it does the same as setting database to
None.