added scipy to setup.py. modified test to use a list.

Author: Mahmoud Lababidi

setup.py

@@ -19,6 +19,7 @@
       keywords=['scikit', 'sklearn', 'pandas'],
       install_requires=[
           'scikit-learn>=0.13',
+          'scipy>=0.14',
           'pandas>=0.11.0',
           'numpy>=1.6.1']
 )

tests/test_dataframe_mapper.py

@@ -54,7 +54,7 @@ def test_with_iris_dataframe(iris_dataframe):
 def test_with_car_dataframe(cars_dataframe):
     pipeline = Pipeline([
         ("preprocess", DataFrameMapper([
-            ("description", CountVectorizer()),
+            ("description", [PassthroughTransformer(), CountVectorizer()]),
         ])),
         ("classify", SVC(kernel='linear'))
     ])