nanops on datetime objects failing
Hi,

It looks like apply_along_axis does not play well with objects that have no length? If I go comment out the numpy 1.6.1 workaround in Python 3.x portion, this goes back to working fine.

Thanks!

For example:

> > > import pandas as ps
> > > x = ps.Series([ps.datetime(2011,4,3)])
> > > x.min()

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    x.min()
  File "C:\Python27\lib\site-packages\pandas\core\series.py", line 722, in min
    return nanops.nanmin(self.values, skipna=skipna, copy=True)
  File "C:\Python27\lib\site-packages\pandas\core\nanops.py", line 118, in nanmin
    result = np.apply_along_axis(**builtin**.min, apply_ax, values)
  File "C:\Python27\lib\site-packages\numpy\lib\shape_base.py", line 104, in apply_along_axis
    outshape[axis] = len(res)
TypeError: object of type 'datetime.datetime' has no len()
