committing fix for bug with --read-locally

[Arthur P]

This code:

      def last_local_file_trigger

        Dir.glob(File.join(local_directory, '*.trig')).last

      end

does NOT get the last written file.  It is basically nondeterministic and can choose pretty much any *.trig file in the directory. 

The fix is to sort by time before doing .last; i'm committing this to my branch if you need this fix.