What's new: bagging
DOC copyedit DBSCAN implementation notes
DOC reference for k-means++ in clustering narrative
FIX: logaddexp(-inf, -inf) == -inf and not NaN
Merge branch 'master' of github.com:scikit-learn/scikit-learn into logaddexp-fix
DOC: add docstring to _logaddexp
DOC: bootstrap=True by default