add paramter selection modual
Merge pull request #2 from sealhuang/master

add nested-cv functions
update the feature selection.
add rf model paramter selection and evaluation modual.
Delete param_slt.py
Merge pull request #3 from BloodNg/master

RF model parameter selection
update evaluate metrics
Merge pull request #4 from BloodNg/master

nestcv framework  and single subject evaluation