ipy_autoreload %aimport doesn't handle submodules properly

The %aimport from autoreload extension doesn't import submodules correctly:

In [1]: import ipy_autoreload

In [2]: %aimport numpy.linalg

In [3]: numpy.linalg
------------------------------------------------------------
Traceback (most recent call last):
  File "<ipython console>", line 1, in <module>
NameError: name 'numpy' is not defined

This is fixed in lp:~pauli-virtanen/ipython/ipython-autoreload:

In [1]: import ipy_autoreload

In [2]: %aimport numpy.linalg

In [3]: numpy.linalg
Out[3]: <module 'numpy.linalg' from '/usr/lib/python2.6/dist-packages/numpy/linalg/__init__.pyc'>