DOC: edited some docstrings
DOC: added references into classes.rst
ENH: rename boost method to _boost
DOC: cosmits + narrative documentation (begin)
DOC: proper citations
DOC
FIX: TypeError for regressor
FIX minor comment
FIX: docs, code clean up, learn_rate -> learning_rate
FIX: plot_adaboost_classification.py
don't enforce DTYPE at the ensemble level
DOCS: note generator behaviour in staged methods
TEST: make test_importances more stable
DOC: narrative documentation
DOC: What's new
TEST: base_estimator
DOC: classes_ and n_classes_
DOC: put docstrings into subclasses to make them appear in the documentation
rename learn_rate -> learning_rate
raise ValueError if len(y_true) is less than or equal to 1
add some tests for weighted_r2_score