WEB rm survey bar

This reverts commit 86e8b0d2a3533253a7082591f572d73897c02a2c.
This reverts commit 53a9b64c96ef1e52779b1226a88e934508eaaff7.
DOC typo: Pereptron -> Perceptron.
BUG move label_ from BaseLibSVM to BaseSVC

Currently, SVR has a label_ that raises an AttributeError because
of missing classes_.

Also corrected the deprecation warning which calls it labels_.
COSMIT decouple regression and classification in SVMs
DOC: typo in warning

Thanks for alexsavio for reporting
DOC: small fix in the regression's score method documentation
changed wording in linear model docs about Normalized. It was frustrating me haha
TST some more tests for multi output lars
BUG: reassignment_ratio == 0 in MiniBatchKmeans

And add an additonal test
Minor bug fix in metrics.adjusted_rand_score
COSMIT translate lgamma replacement to C and clean it up
BUG: sparse center reassignment MiniBatchKMeans
DOC fix typo in LinearSVC error message
DOC: reference for discretise option
DOC update SMART notation in TfidfTransformer docs

Logarithmic tf wasn't described.
DOC: make distinction between evaluation and pairwise metrics.
FIX make error message work when return_path=False

Btw I feel that getting "references" for numbers out of numpy arrays is pretty ugly.
TST fix random states in all dict learning tests, make test independent of test sequence.
DOC add return values of cross_val_score and train_test_split to docstrings.
COSMIT :: in rst is easier for syntax highlighters