Added notebook to illustrate the issue with #135
Added notebook to illustrate the issue with #135

nilmtk/nilmtk,josemao/nilmtk,pauldeng/nilmtk,AlexRobson/nilmtk,mmottahedi/nilmtk,jaduimstra/nilmtk,HarllanAndrye/nilmtk,nilmtk/nilmtk