added cross_validators.py
added kfold
modified tests
modified tests
modified tests
backwards compatibility
stupid flake8
stupid flake8
stupid flake8
throw in LOO for kicks
rename loo
merge from @eigenstate
Merge pull request #42 from cxhernandez/cross_validators

added cross_validators.py
zip_safe=False (@eigenstate)
Merge pull request #43 from rmcgibbo/zip-safe

zip_safe=False (@eigenstate)
train scores
mean_cv_score -> mean_test_score in execute_plot
Add stratified cross validators
Move logic into BaseCVFactory subclasses
Update fit_estimator.py