Is this numpy 1.7 specific? I can't do this with 1.6:
```
>>> m
masked_array(data =
 [[0 1 2 3 4]
 [5 6 -- -- 9]
 [10 11 -- -- 14]
 [15 16 17 18 19]
 [20 21 22 23 24]],
             mask =
 [[False False False False False]
 [False False  True  True False]
 [False False  True  True False]
 [False False False False False]
 [False False False False False]],
       fill_value = 999999)

>>> m.mask.any(axis=(0,1))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: an integer is required
```