Automatic color cycling when plotting consecutive timeseries without arguments disappeared in 0.8.1
The fact that it took so long for anyone to realise the behaviour had changed just goes to show that it is a very minor problem. I was pretty sure it used to work at one point so I chased it down. I'd say it is quite useful from time to time when you are working interactively and feeling lazy at the same time. 

In case the behaviour change was not intentional I'd be willing to look into it but some pointers would be appreciated to get started.

Here is a snippet:

``` python
import matplotlib.pyplot as plt
import pandas as pd

for i in range(3): pd.util.testing.makeTimeSeries().cumsum().plot()
plt.show()
```

Here is the output with pandas 0.8.0:
![ts_plotting_0 8 0](https://f.cloud.github.com/assets/1680079/138036/b6182748-7185-11e2-9ea8-61e94f53a905.png)

Here is the one with pandas 0.8.1:
![ts_plotting_0 8 1](https://f.cloud.github.com/assets/1680079/138035/b0a6f4d8-7185-11e2-80af-14dec125d4d4.png)
