CLN: Add .gitattribtes to fix crlf issues.
CLN: Change CRLF --> LF
BLD: Add binary files to gitattributes too
Merge pull request #3915 from jtratner/fix-crlf-in-repo

CLN: Fix CRLFs in repo + add .gitattributes
Merge pull request #3939 from jreback/partial_string

DOC: partial string indexing docs in timeseries.rst (GH3938)
API: more consistency in the to_datetime return types (give string/array of string inputs) (GH3888)