Move project directory from scikits.learn to sklearn

Makefile

doc/install.rst

doc/modules/classes.rst

doc/modules/clustering.rst

doc/modules/covariance.rst

doc/modules/cross_validation.rst

doc/modules/decomposition.rst

doc/modules/dp-derivation.rst

doc/modules/feature_extraction.rst

doc/modules/feature_selection.rst

doc/modules/gaussian_process.rst

doc/modules/grid_search.rst

doc/modules/hmm.rst

doc/modules/linear_model.rst

doc/modules/manifold.rst

doc/modules/mixture.rst

doc/modules/multiclass.rst

doc/modules/naive_bayes.rst

doc/modules/neighbors.rst

doc/modules/pls.rst