BUG: Removed import nose on top of testing.py script

I'm having this error in master branch:

>>> import pandas
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "pandas/__init__.py", line 33, in <module>
    from pandas.util.testing import debug
  File "pandas/util/testing.py", line 17, in <module>
    import nose
ImportError: No module named nose