fixing bug in linear_model.SGDClassifier for multi-class warm start
removing accidental space
Merge pull request #1803 from kmike/hmm

Update outdated comments in sklearn.hmm
DOC update example path
Merge pull request #1804 from AlexanderFabisch/fix_example_path

DOC update example path
Cosmit: remove needless blank lines.
Merge branch 'master' into pr/1798
COSMIT remove unneeded slashes and replace xrange with range in _hmmc extension module