MonthStart resample errors on binning.

[dalejung]

from pandas import *
N = 1000
s = Series(np.arange(N), index=date_range(start='1/1/2012', freq='5min', periods=N))
s.resample('MS')

Not sure if this is new, first time using MS.

[wesm]

I doubt it's new, but could have been introduced by changes in the last few days. I'll sort it out today or tomorrow. Thanks!

[wesm]

Was actually caused by something else. Should test the month-begin frequencies a bit more systematically but looking good now