add SVMLightFormatConverter and KDDCup2012Track2DataConverter
add SVMLightFormatToBinConverter and WeightVectorFromBinConverter
modify classifier examples for using binary format
fix bug of LessRAMWeightVector#innerProduct
modify SVMLightFormatToBinConverter to use bias term
modify KDDCup2012Track2DataConverter to use user gender and age
add KDDCup2012Track2Scorer, AUCCalculator and ScoreStruct
add BinaryClassifierPredictRunner
add RandomShuffle
add LogResSGDLearner, LogResSGDTrainWithCacheRunner and LessRAMLogResSGDTrainWithCacheRunner