ER/API: unicode indices not supported on table formats in py2 (GH5386)
Merge pull request #5387 from jreback/hdf_index_tests

ER/API: unicode indices not supported on table formats in py2 (GH5386)
DOC: minor io.rst updates / cookbook.rst
fixing https://github.com/pydata/pandas/issues/5372
ENH/CLN: Redefine str.match, and issue a warning on deprecated default behavior.
BUG: groupby with a Float like index misbehaving when the index is non-monotonic (related GH5375)
Merge pull request #5393 from jreback/groupby_iloc

BUG: groupby with a Float like index misbehaving when the index is non-monotonic (related GH5375)
DOC: Expanded section on string methods in wake of extract/match change.
Merge pull request #5376 from RomanPekar/periodIndex-repr

repr for PeriodIndex does not handle <=2 elements well (GH5372)
CLN: Minor touchups to docstrings + use assert_produces_warning
Merge pull request #5224 from daniel-ballan/redefine-match