New NNFrames interface (#162)
New NNFrames interface (#162)

* scala

* separate

* python update

* create unit test

* style fix

* zoo

yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL