how to make parallel_coordinates scale each y axis separately and add y-ticks?
Here is the code:

```
import pandas
import matplotlib.pyplot as plt
from pandas.tools.plotting import parallel_coordinates
import numpy as np
from pandas import DataFrame
mypos = np.random.randint(10, size=(100, 2))
mydata = DataFrame(mypos, columns=['x', 'y'])
myres = np.random.rand(100, 1)
myclass = np.random.randint(3, size=(100, 1))
mydata['res'] = myres
mydata['class'] = myclass
parallel_coordinates(mydata, 'class')
```

![enter image description here](http://i.stack.imgur.com/vml9S.png)

Clearly, putting all dependent variables on the same scale is inappropriate here.
