Fixed an edge-case failure in TimeSeries._nearest
charmworld.reports
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* Changed the _nearest method to check if the date is less than the next
series date, not less than or equal; so that if the next date in the series is
an exact match for the date we're looking for we use it, rather than the date
just before it.
R=rharding
CC=
https://codereview.appspot.com/7066060