BUG: scikits.learn -> sklearn: backward compatibility

scikits/learn/cross_val.py

+import warnings
+warnings.warn('scikits.learn namespace is deprecated, please use sklearn instead')
+from sklearn.cross_val import *

scikits/learn/feature_extraction/image.py

+import warnings
+warnings.warn('scikits.learn namespace is deprecated, please use sklearn instead')
+from sklearn.feature_extraction.image import *
+

scikits/learn/feature_extraction/text.py

+import warnings
+warnings.warn('scikits.learn namespace is deprecated, please use sklearn instead')
+from sklearn.feature_extraction.text import *
+