Dropped compatibility with Python 2.5
utilities: Widen isinstance() check in @public decorator
polys: Decorated classes with @public decorator
Replace all except Exception, e with except Exception as e
Removed min_python_version=(2, 6) from import_module() invocations
Access flags.hash_randomization with getattr() because of PyPy
Removed unnecessary invocations of @doctest_depends_on()
Remove all `from __future__ import with_statement` lines
Use f(*args, kwarg=True) instead of f(*args, **{'kwarg':True})
core: Added (partial) support for count() and index() to Tuple
Replace all list(tuple).{index,count}() with tuple.{index,count}()
Merge branch 'master' into drop-python-2.5

Conflicts:
	bin/test
Merge pull request #2273 from mattpap/drop-python-2.5

Remove Python 2.5 stuff (#3930)