Merge branch 'master' into sgd-rename

doc/contents.rst

doc/index.rst

doc/modules/classes.rst

doc/modules/gaussian_process.rst

doc/modules/linear_model.rst

doc/modules/mixture.rst

doc/modules/svm.rst

doc/sphinxext/gen_rst.py

doc/themes/scikit-learn/static/nature.css_t

scikits/learn/base.py

scikits/learn/linear_model/sparse/logistic.py

scikits/learn/pca.py

scikits/learn/svm/__init__.py

scikits/learn/svm/base.py

scikits/learn/svm/liblinear.py

scikits/learn/svm/libsvm.py

scikits/learn/svm/sparse/__init__.py

scikits/learn/svm/sparse/base.py

scikits/learn/svm/sparse/libsvm.py

scikits/learn/utils/extmath.py