moved class_prior in NB to __init__
added deprecation warning to fit function
fixed docstring tests
fixed typos
added warnings
updated based on comments
fixed local variables
renamed the new parameter to class_wieght
fixed docstring test
COSMIT update warning, pep8
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