Fix ValueError: Buffer dtype mismatch, expected 'INTP' but got 'long' on win-amd64
Merge pull request #3017 from cgohlke/patch-2

Fix ValueError: Buffer dtype mismatch, expected 'INTP' but got 'long' on win-amd64
FIX MSVC compile error C2036: 'void *' : unknown size

We were inadvertently using a GCC extension (pointer arithmetic on
void *). Fixes #2963, #3016.
TST: Fix ValueError: Buffer dtype mismatch, expected 'npy_intp' but got 'long' on win-amd64
TST don't run fast_dot tests on numpy>=1.7.2 + pep8
TST/COSMIT tests/comments for [sparse]center_data

Also removes sparse_std which was redundant
FIX center data to unit variance with normalize=True