DOC describe SVM probability calibration (and advise against it)
DOC further comments on SVM probabilities
ENH multiclass probability estimates for SGDClassifier

Fixes #1814.
BUG digits grid search was passing cv to the wrong method

GridSearchCV actually ignores this argument, as reported in #1815.
DOC typos in grid search docstrings
Merge branch 'master' of github.com:scikit-learn/scikit-learn