General spelling fixes

Makefile

appveyor.yml

benchmarks/bench_isotonic.py

continuous_integration/test_script.sh

doc/datasets/twenty_newsgroups_fixture.py

doc/themes/scikit-learn/static/css/bootstrap.css

doc/tutorial/machine_learning_map/parse_path.py

doc/tutorial/machine_learning_map/pyparsing.py

examples/applications/plot_out_of_core_classification.py

examples/applications/plot_stock_market.py

examples/applications/wikipedia_principal_eigenvector.py

examples/calibration/plot_calibration_curve.py

examples/calibration/plot_compare_calibration.py

examples/cluster/plot_kmeans_silhouette_analysis.py

...s/cross_decomposition/plot_compare_cross_decomposition.py

examples/ensemble/plot_voting_decision_regions.py

examples/linear_model/plot_ard.py

examples/linear_model/plot_bayesian_ridge.py

examples/model_selection/plot_learning_curve.py

examples/neural_networks/plot_mlp_alpha.py