Merge branch 'cython-ball-tree'

AUTHORS.rst

doc/conf.py

doc/index.rst

doc/logos/scikit-learn-logo-thumb.png

doc/modules/decomposition.rst

doc/modules/multiclass.rst

doc/sphinxext/gen_rst.py

doc/supervised_learning.rst

examples/applications/svm_gui.py

examples/applications/topics_extraction_with_nmf.py

examples/cluster/plot_color_quantization.py

examples/cluster/plot_lena_ward_segmentation.py

examples/cluster/plot_ward_structured_vs_unstructured.py

examples/covariance/plot_covariance_estimation.py

examples/linear_model/plot_ridge_path.py

examples/manifold/plot_lle_digits.py.prof

examples/plot_pls.py

examples/plot_precision_recall.py

examples/plot_roc.py

examples/plot_train_error_vs_test_error.py