Update sanity checks
Cleanup docstrings
Cleanup test and remove restrictions
Update docstring to suggested recommended parameters
Change ROCAUCChannel to RocAucChannel
Cleanup test
Merge remote-tracking branch 'upstream/master' into roc_auc
Cleanup docstrings
Cleanup docstrings
Cleanup
Cleanup test
Update docstring to reflect changes in #772 and roll back erroneous merge
Cleanup test
Clean up formatting in train_extensions/__init__.py
Upstream changes
Reorganize cv tests
Add cv iterators for train/valid/test splits
Add more tests
Update docstrings
Merge in preprocessing stuff