CLN: Remove redundant call to get_splitter
CLN: Remove unused assignment
TST/CLN: moved the legacy tests out of tseries/test_timeseries.py to tseries/test_timeseries_legacy.py
BUG: (GH4758) Bug in multi-indexing with a partial string selection as one part of a MultIndex
Gotachas -> Gotchas
Merge pull request #4762 from rgbkrk/patch-1

Gotachas -> Gotchas
Merge pull request #4761 from jreback/dt_multi

BUG: in multi-indexing with a partial string selection (GH4758)
API: raise a TypeError when isin is passed a string
Merge pull request #4765 from cpcloud/series-isin-fix

API: raise a TypeError when isin is passed a string
Merge pull request #4753 from kjordahl/cleanup/redundant-splitter

CLN: Remove redundant call to get_splitter
BUG: allow replacement with a single list

This requires adding the ``method`` keyword parameter back in.