Sparse equivalents of Normalizer, LengthNormalizer and Binarizer.

scikits/learn/feature_extraction/sparse/text.py

scikits/learn/feature_extraction/text.py

scikits/learn/preprocessing/setup.py

scikits/learn/preprocessing/sparse/__init__.py

scikits/learn/preprocessing/sparse/setup.py

scikits/learn/preprocessing/sparse/src/_preprocessing.c

scikits/learn/preprocessing/sparse/src/_preprocessing.pyx

scikits/learn/preprocessing/tests/test_preprocessing.py