ajout du nouveau fetcher
Merge branch 'weakSignalv5' of https://github.com/ClaraVista-IT/matrixFactorization into weakSignalv5

Conflicts:
	src/main/scala/dataset/LRSparseDataSet.scala
	src/main/scala/entry/lmain.scala
	src/main/scala/model/LRModel.scala
	src/main/scala/optimization/PROXSAGSparse.scala