WIP: fixes to rolling_window functions with center=True#3161

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Commits on Mar 31, 2013

TST: add rolling_mean test, validate against numpy.convolve based rolling_mean— y-p
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BUG: rolling_X functions mishandle edges when center = True
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ENH: translate min_periods before passing into _rolling_moment
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TST: modify check_moment to accomedate expected center=True behaviour
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ENH: make padding value a param of _rolling_moment
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Fixes to roll_skew, roll_kurt

jreback
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generalize to multi dimensional case

jreback
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TST: bring back test_moments tests for frames
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Refactor, Sort out the 2d case
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Rework tests
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