Merge branch 'master' of https://github.com/dubourg/scikit-learn into dubourg-master

examples/gaussian_process/plot_gp_diabetes_dataset.py

.../plot_gp_probabilistic_classification_after_regression.py

examples/gaussian_process/plot_gp_regression.py

scikits/learn/gaussian_process/correlation_models.py

scikits/learn/gaussian_process/gaussian_process.py

scikits/learn/gaussian_process/regression_models.py

...its/learn/gaussian_process/tests/test_gaussian_process.py