Returned CSCMatrix constructor to private[linalg], added new alternate constructor publicly
Returned CSCMatrix constructor to private[linalg], added new alternate constructor publicly

scalanlp/breeze,cilier/breeze,mredaelli/breeze,calippo/breeze,wstcpyt/breeze,claydonkey/breeze,ContentSquare/breeze,nikdon/breeze,crealytics/breeze,chen0031/breeze,sheide/breeze