BUG: allow itertuples to work with duplicate columns
DOC: add release notes and bug fix notes
Merge pull request #3879 from cpcloud/itertuples-bug-3873

BUG: allow itertuples to work with frames with duplicate column names
BUG: not processing TypeError on reading some json (so was failing rather than trying not-numpy for dtypes)
ENH: added convert_axes argument to control whether to coerce axes

ENH: changed dtype argument to accept a dict for a per-column dtype conversion, or
     turn off conversion (default is True)

ENH: changed parse_dates to convert_dates, now defaulting to True

BUG: not processing correctly some parsable JSON
TST: tests for numpy=True/False differeing in parsing
PERF: changed default to numpy=False to have correct parsing using unordered JSON