Add tests for partial fit.
remove `steps` from Attributes of docstring
Merge branch 'master' of github.com:scikit-learn/scikit-learn
Merge pull request #1331 from jaquesgrobler/master

remove `steps` from Attributes of docstring
FIX : add condition pos_label!=None for multiclass purpose in metrics.precision_recall_fscore_support
TEST : add a test, test_precision_recall_f1_score_multiclass_break(), that breaks with current master and now works
Change metrics.py as before and shorten test (test_precision_recall_f1_score_multiclass_break() in test_metrics.py) to show where it breaks
FIX : clean test + pep8 + reply fix to the code
Update to the clustering.rst module file for k-means. Added a plain language description and the objective function.
Document epsilon.
Better documentation for epsilon in SGD.
BUG: dot on sparse matrices broken in recent numpy
Remove predict_proba from Perceptron and PassiveAggressiveClassifier.

Fixes #1336.
Merge branch 'master' into pr/1279

Conflicts:
	doc/whats_new.rst
DOC: Improved the code that shows how to export a decision tree to Graphviz and generate a PDF file.
Skip doctest for the Python code involving pydot.
Skip doctest for the remaining line involving pydot.
FIX hotfix for NMF sparsity problem
BUG: fix doctest bug

Bug introduced by @tjanez : in doctests, continuations are written with
'...' and not '>>>'
BF: GridSearchCV + unsupervised covariance shrinkage selection.