In Python 3.x a subclass will not inherent the __hash__ method from
the parent classes if the subclass defines a __eq__ method. This
means that without defining our own __hash__ the SetuptoolsVersion
classes are unhashable.

* Enables indexing the SetuptoolsVersion objects, triggering the
  legacy behavior warning.
* Enables comparing the SetuptoolsVersion object to a tuple, again
  triggering the legacy behavior warning.

Now that pytest is invoked via setup.py, it should no longer be necessary to continue to support running tests via setup.py test.

Conflicts:
	.hgtags
	CHANGES.txt
	ez_setup.py
	setuptools.egg-info/requires.txt
	setuptools/version.py

Fix #277, data files in symbol link directory are not included issue

--HG--
branch : bugfix-277