FIX OrthogonalMatchingPursuit normalized twice
DOC correct/copyedit linear model docstrings

Many models actually support sparse matrices at predict time, but
did not advertise this.
One more Python 3 fix in feature_extraction.rst
Update what's new
ENH add "make_y_1d" to utils, use it in estimators where needed.
fix make ``make_y_1d`` save for lists.