COMPAT/BUG: compat with pytz 2014.3, exposing several test that don't localize
            properly (GH7137)
Merge pull request #7144 from jreback/tz

COMPAT/BUG: compat with pytz 2014.3, exposing several test that don't localize (GH7137)
ENH: Centrally truncate DataFrames