ENH: export py3k.integer_types from numpy.compat
BUG: check axes and window length input for all integer types

On Python 2.7, the long type was excluded.
Merge pull request #3699 from charris/backport-1.8-3698

Backport 1.8 3698
ENH: add support for Python 3.4 ast.NameConstant
TST: add test for Python 3.4 _ast.NameConstant
Merge pull request #3706 from charris/backport-1.8-3701

Backport 1.8 3701