classifier → streaming 关系

文件在 src/shogun/classifier	在 src/shogun/features/streaming 中引用
svm / OnlineLibLinear.cpp	StreamingDenseFeatures.h
svm / OnlineLibLinear.cpp	StreamingSparseFeatures.h
svm / OnlineSVMSGD.h	StreamingDotFeatures.h
vw / VowpalWabbit.h	StreamingVwFeatures.h