DOC: move trellis under visualization.rst
BUG: Work-around openpyxl-2.1.0 NumberFormat removal
Merge pull request #8356 from jreback/excel_fix

BUG: Work-around openpyxl-2.1.0 NumberFormat removal
ENH/BUG: allow timedelta resamples
Merge pull request #8345 from jreback/resample

ENH/BUG: allow timedelta resamples
DOC: timedelta resample docs
Merge pull request #8353 from TomAugspurger/trellis-doc

DOC: move trellis under visualization.rst
BUG: Bug in alignment with TimeOps and non-unique indexes (GH8363)
Merge pull request #8364 from jreback/datetime_ops

BUG: Bug in alignment with TimeOps and non-unique indexes (GH8363)
BUG: rolling_window() properly averages weights in mean=True mode; removed scikits-timeseries dependency for testing; added further tests for rolling_window()