need for 'save_dataframe'
Saving and Retrieving are basic to data operations.  The defacto save / retrieve in 
pandas, at least from Wes's book, seems to be  to_csv and .read_csv  These are great, 
but what is saved is not what is returned:

In [49] frame
Out[49]: 
     fun        people  state
0   pinball   Joe       OH
1   food     Mary       NJ

In[50] frame.to_csv('experiment.csv')

In[51] new_frame=pd.read_csv('experiment.csv')

In[52]  new_frame
Out[52]: 

```
  Unnamed: 0   fun           people    state
```

0          0               pinball     Joe         OH
1          1               food         Mary       NJ

As you can see, a new index column is added.  I think it would probably be very easy to
write a 'save_DataFrame' and a 'read_DataFrame' that would save the index and the columns
and restore them as they were saved.

I realize this is no big deal once you know the program and the suggstion is, admittedly, mostly philosophical and to make things easier for newbies.   But I think this is the correct structure for
a data manipulation program.

This is just my opinion and I will only write this once.  I don't want to argue about it.
Please do not write to me and tell me how stupid I am.  Feel free just to trash this or 
close it out without informing me.

 Thanks.  -- Greg
