added test objects for CH 15 Python Std. Lib.; fix: _IS_PY3 to PYTHON3;
moved io tests that fail >= 3.2 and >= 2.6 to failures objects
dill_test2 now prints the name as well as the type that fails


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/dill@543 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/dill