ImportError: cannot import name _get_all_lines, when trying to plot a grouped DF
I have a DataFrame of stock close prices with a DatetimeIndex , `close`. 

```

                     BARC:LON  HSBA:LON  LLOY:LON  STAN:LON
timestamp                                                  
2014-07-03 08:02:00   217.551   601.938   76.2100   1223.36
2014-07-03 08:04:00   217.200   602.100   75.8520   1220.00
2014-07-03 08:06:00   217.500   602.700   75.8700   1221.50
2014-07-03 08:08:00   217.750   602.400   75.9777   1222.50
2014-07-03 08:10:00   218.450   602.675   75.9440   1221.50
```

I want to plot these in separate graphs for each day, so I do:

```
for day,data in  close.groupby(close.index.date):
  data.plot(title=day)
  show()
```

But this throws

```
C:\Users\xxx\local\Enthought\Canopy\User\lib\site-packages\pandas\tseries\plotting.py in <module>()
     19                                       TimeSeries_DateFormatter)
     20 
---> 21 from pandas.tools.plotting import _get_all_lines, _get_xlim
     22 
     23 #----------------------------------------------------------------------

ImportError: cannot import name _get_all_lines
```

I can't find _get_all_lines anywhere. I recall doing this on my linux machine and it worked fine. This is running on Windows, pandas 0.14.1.
Also this works if I call matplotlib directly using plot(data), so the code doesn't seem to be at fault.
