Fixed iris.util.array_equal to avoid issues with fully masked arrays
pp 365 day cal

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Modifications to interpolate.py for move to SciPy 0.13.2
Merge pull request #915 from marqh/pp365

pp 365 day cal
Docstring edits for _interp1d_rolls_y
Merge pull request #905 from esc24/array_equal_with_mask

Fixed iris.util.array_equal to avoid issues with fully masked arrays
Merge pull request #934 from dkillick/scipy_0-13-2_interpolate

Update scipy dependency to v0.13.2
Added datetime cell comparison.
Documentation update about cell usage of a PartialDateTime.