BUG: Series.iteritems() isn't lazy

[TomAugspurger]

The docstring indicates that it is supposed to be lazy, but we return lzip(iter(self.index), iter(self)). That should be zip(...) right? Or is the docstring wrong?

[jreback]

hmm should be using izip (I think same in py3)

see if anything breaks

[TomAugspurger]

Compat defines zip to be izip if Py2