Bug in quantile?
Hi folks,

I'm using Pandas 0.14.0 with Python3 on a 64bit Linux Mint.  It looks like the Pandas `quantile` function is not working properly with the `axis=1` keyword.  I'm getting the same output as `axis=0`, as you can see below.

```
In [23]: import numpy as np
In [24]: import numpy as np

In [25]:  df = pd.DataFrame(np.array([[1, 1], [2, 10], [3, 100], [4, 100]]),
              columns=['a', 'b'])

In [26]: df
Out[26]:     
   a    b
0  1    1
1  2   10
2  3  100
3  4  100

In [27]: df.quantile(0.5, axis=1)
Out[27]: 
a     2.5
b    55.0
dtype: float64

In [28]: df.quantile(0.5)
Out[28]: 
a     2.5
b    55.0
dtype: float64
```
