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
ENH Added custom kernels to SpectralClustering

Fixes #1791.
PY3 + TST decouple test_metrics from random module

Random number generator changes per Python 3.3.
Also, don't use unseeded np.random. Should fix #1811.
BUG: Use Py_ssize_t to index into numpy arrays to help Python handle big data.
Indent a few copy/pasted function declarations for consistency.
Fixes #1466.
MISC: Update _tree.c with cython.