DOC: Add where and mask to API doc
DOC: Add Nano to offsets table
Merge pull request #8879 from sinhrks/nanodoc_2

DOC: Add Nano to offsets table
Merge pull request #8876 from sinhrks/doc_where

DOC: Add where and mask to API doc
COMPAT: windows compat for tests for dtype inference in parser xref (GH8833)
BUG/ENH: cleanup for Timedelta arithmetic

Fixes GH8813
Fixes GH5963
Fixes GH5436

If the other argument has a dtype attribute, I assume that it is ndarray-like
and convert the `Timedelta` into a `np.timedelta64` object. Alternatively, we
could just return `NotImplemented` and let the other type handle it, but this
has the bonus of making `Timedelta` compatible with ndarrays.

I also added a `Timedelta.to_timedelta64()` method to the public API. I
couldn't find a listing for `Timedelta` in the API docs -- we should probably
add that, right?

Next up would be a similar treatment for `Timestamp`.
Merge pull request #8896 from pydata/winfix4

COMPAT: windows compat for tests for dtype inference in parser xref (GH8833)
Merge pull request #8884 from shoyer/fix-timedelta-math

BUG/ENH: cleanup for Timedelta arithmetic
DOC: v0.15.2.txt fixups
BUG CSV: fix problem with trailing whitespace in skipped rows, issues 8661, 8679
ENH CSV: Reduce memory usage when skiprows is an integer in read_csv, issue 8681