TST: fix cdec historical test to be more general with how it tests values
these comparisons start failing with pandas 0.13
TST: fix ghcn daily tests for pandas 0.13
using pandas series directly as a mask no longer works
explicitly convert dates to timestamps so operations works consistently across pandas versions
use a different float -> str conversion strategy for pandas 0.13
series.astype('|S5') no longer works - the fixed width is ignored
explicitly cast list of months to a PeriodIndex object
so masking works as expected across supported pandas versions
convert NaNs to None in a way that works across supported pandas versions
update get_store() calls to pandas 0.13 API
args are no longer accepted by get_store(), only kwargs
fix internal DatetimeIndex conversion to use pandas.to_datetime()
it's more idiomatic pandas and 0.13 enforces it
drop support for pandas 0.10.1
there are some odd tests that fail only on 0.10.1 and I don't have much time at
the moment to look into it - so I'm going to punt on it :/
TST: fix ghcn_daily_test so it works with pandas 0.11
by casting explicitly to a daily period instead of implictly with date string
add note in changelog about dropping 0.10.1 support and adding 0.13
Merge pull request #73 from twdb/fix/work-with-pandas-0.13

update for pandas 0.13