rename enums of AllReduceCoordinator.Command
remove redundant Generics of AllReduceCoordinator
rename myorg.allreduce.AllReduceCoordinator to myorg.network.NodeInfoIndexServer
delete redundant myorg.examples.allreduce.AllReduceReducer
change AllReduceClient to use IntWritableSumAllReducer
rename allreduce example classes
delete redundant import
fix bug not to use scaleFactor in WeightVector
add addVector() to WeightVector
add constructor with no args to WeightVector
add SVMPegasosTrainInMemoryClient and some classes
rename SVMPegasosTrainInMemoryClient to SVMPegasosTrainClient
fix miss spelling in SVMPegasosTrainClient
add SVMPegasosTrainMapper and SVMPegasosTrainRunner as examples on Hadoop