cosmit
PY3: fix remaining cStringIO imports
Merge branch 'py3' of https://github.com/sdegryze/scikit-learn into py3
PY3: reindent the test_mldata.py file
Merge branch 'py3' of https://github.com/sdegryze/scikit-learn into py3
PY3: fix for string literals in datasets' test_base.py
converting string literal to bytes using six in cython file