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
