COSMIT pep8

sklearn/covariance/tests/test_covariance.py

sklearn/datasets/samples_generator.py

sklearn/datasets/tests/test_samples_generator.py

sklearn/grid_search.py

sklearn/hmm.py

sklearn/kernel_approximation.py

sklearn/linear_model/coordinate_descent.py

sklearn/linear_model/least_angle.py

sklearn/linear_model/tests/test_least_angle.py

sklearn/preprocessing/__init__.py

sklearn/tests/test_kernel_approximation.py

sklearn/utils/extmath.py

sklearn/utils/tests/test_sparsefuncs.py

sklearn/utils/validation.py