retrograde plugin: Typo in plugin name

var mscorePlugin = {
      menu: 'Plugins.Retrogade selection',
      init: init,
      run:  run
      };

There is an 'r' missing, I guess it should rather be:

var mscorePlugin = {
      menu: 'Plugins.Retrograde selection',
      init: init,
      run:  run
      };

      score.appendPart("Flute");    // create two staff piano part
      score.appendMeasures(50);      // append five empty messages

Guess it should rather be:

      score.appendPart("Flute");    // create one staff flute part
      score.appendMeasures(50);      // append fifty empty measures

            for (var voice = 0; voice < 1; voice++) {
                  cursor.voice = voice;
                  cursor.goToSelectionStart();

so it could as well go away, reducing the code to:

      for (var staff = startStaff; staff < endStaff; ++staff) {
            cursor.goToSelectionStart();
            cursor.staff = staff;

            while (cursor.tick() < selectionEnd.tick()) {
                  if (cursor.isChord()) {
                        var chord = cursor.chord();
                        chordArray.push(chord);
                  }else if (cursor.isRest()){
                        var rest = cursor.rest();                    
                        chordArray.push(rest.tickLen);
                  }
                  cursor.next();
                  }
            }

            if(typeof chord == 'object'){

Shouldn't this rather be the following?

            if(typeof chord === 'object'){