Plotting non-periodic timeseries not working
import pandas as pd
from dateutil.relativedelta import relativedelta

stamps = [p for p in pd.DatetimeIndex(freq='60Min',start=pd.datetime(2012,6,12),periods=8)]
series = pd.TimeSeries([1,2,3,4,5,6,7,9], index=stamps)
series = series[:-1].append(pd.Series(series[-1],index=[series.index[-1]-relativedelta(seconds=1000)]))
series.plot()

The x axis becomes pretty bogus. Is this known, or am I perhaps doing something wrong?
