CLN: Remove redundant call to get_splitter
CLN: Remove unused assignment
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
Merge pull request #4755 from jreback/pickle_compat

BUG: TimeSeries compat from < 0.13
BUG: Bug with reindexing where a non-unique index will now raise ValueError (GH4746)
CLN: refactored out take from core/frame.py to use core/generic.py version