Yahoo Tests Failing
For example in `test_get_data_single_symbol`:

```
In [4]: df = web.get_data_yahoo('GOOG')

In [5]: df
Out[5]: 
              Open    High     Low   Close   Volume  Adj Close
Date                                                          
2014-03-27  568.00  568.00  552.92  558.46    13100     558.46
2014-03-28  561.20  566.43  558.67  559.99    41100     559.99
2014-03-31  566.89  567.00  556.93  556.97    10800     556.97
2014-04-01  558.71  568.45  558.71  567.16     7900     567.16
2014-04-02  599.99  604.83  562.19  567.00   146700     567.00
2014-04-03  569.85  587.28  564.13  569.74  5085200     569.74

[6 rows x 6 columns]
```

So this line fails:

```
self.assertEqual(df.Volume.ix['OCT-08-2010'], 2859200)
```
