Cannot localize days on boundary of representable dates

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Either of the following will error with an OverflowError: date value out of range:

pytz.timezone('Africa/Abidjan').localize(datetime(year=1, month=1, day=1))

pytz.timezone('Africa/Abidjan').localize(datetime(year=9999, month=12, day=31))

This is because in the localize function (tzinfo.py:309 in the 2015.2 release) you look at the previous and the next day, but those might not be representable dates.