textFileWriter is naming rolling log files with day-in-year not day-in-month

FileStreams.textFileWriter() is generating a name like: scannerReadings_201606179_150021

Notice the "179". It should be "27" - it's June 27th. The "179" is the number of the day in the year instead of the month.

FileWriterPolicy.ymdhms() needs to specify "dd" instead of "DD" in its SimpleDataFormat() pattern.