Made a start on fixing #376.  Now good sections won't try to create a good section with start == end!
Made a start on fixing #376.  Now good sections won't try to create a
good section with start == end!

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