replacement of es5 functions to es6 classes feat p5.Phrase , p5.Part ,P5.Score (#538)

Author: endurance21

src/app.js

@@ -69,20 +69,26 @@ import './reverb';
 import Metro from './metro';
 p5.Metro = Metro;
 
-import './looper';
+
+import { Phrase, Part, Score } from './looper';
+p5.Phrase = Phrase;
+p5.Part = Part;
+p5.Score = Score;
+
 
 import SoundLoop from './soundLoop';
 p5.SoundLoop = SoundLoop;
 
+
 import Compressor from './compressor';
 p5.Compressor = Compressor;
 
 
-
 import peakDetect from './peakDetect';
 p5.peakDetect = peakDetect;
 
 
+
 import SoundRecorder from './soundRecorder';
 p5.SoundRecorder = SoundRecorder;