ENH refactoring class weights for SVM and SGD
TST all classifiers now have "classes_". adjust test_common.
ENH remove class_weight_label from python side of SVM
ENH remove class_weight_label from sparse svm
TST move test of "classes_" to the appropriate test in "test_common".
FIX  remaining doctests
DOC docstring for compute_class_weight
ENH remove class_weight_label from LibLinear python side.
ENH removed unused old function
TST fix import in test
ENH addressed @ogrisel's comments.
DOC changed docstring to be more clear.
ENH documented changes for SVC classes_ changes.
ENH move utility function into dedicated file, not __init__.py