add winston log rotation, controlled by config options winston_logging_maxsize, winston_logging_maxfiles, and upgrade to winston@0.7.3 for relevent nodejs 0.10.x fixes

Note: it may not be wanted or necessary to rotate the metrics files (i.e., if there are still consumers of that data, can the deal with the log rotation. Also, are these files sizes significant enough to need log rotation? i.e., are these KB per day?)