Change how play none, one and all feature works.

Author: FernandoBasso

README.md

@@ -17,6 +17,7 @@ Then add the song list to the `init` method:
 
 ```javascript
 player.init({
+    loop: 'none', // 'none', 'one', 'all'. Default: 'none'.
     songs: [
         //{url: 'https://upload.wikimedia.org/wikipedia/en/4/45/ACDC_-_Back_In_Black-sample', name: 'Black in Black'},
         {url: 'songs/one', name: 'Querendo Chorar'},
@@ -27,6 +28,14 @@ player.init({
 });
 ```
 
+The `loop` option works as follows:
+
+- `none`: play up to the last song and stop (don't start over from the beginning
+  of the playlist).
+- `one`: keep playing the same song forever.
+- `all`: after playing the last song, start again from the first item in the
+  playlist.
+
 
 ## Code Style
 

init.js

@@ -354,13 +354,13 @@ var player = (function () {
                 //
                 _self.currentSongIndex = parseInt(this.getAttribute('data-index'), 10);
 
-                changeSong(_self.currentSongIndex);
+                playSong(_self.currentSongIndex);
             });
         });
 
     }
 
-    function changeSong(index) {
+    function playSong(index) {
 
         _self.currentSongIndex = index;
 
@@ -375,18 +375,27 @@ var player = (function () {
 
     function nextSong() {
 
-        if (_self.config.loop === 'none') return;
-
+        // No mater if playlist should replay from start or not, if `loop` is `one`,
+        // keep playing the same song. `currentSongIndex` does not change.
         if (_self.config.loop === 'one') {
-            changeSong(_self.currentSongIndex);
+            playSong(_self.currentSongIndex);
             return;
         }
 
+        // If we are at the last song and `loop` is `none`, DO NOT start over playing at
+        // the first item in the playlist.
+        if (_self.currentSongIndex === _self.config.songs.length - 1 && _self.config.loop === 'none') {
+            return;
+        }
+
+
+        // If we got to this point, either play the next song or start over again
+        // from the first item in the playlist.
         var songIndex = (_self.currentSongIndex < _self.config.songs.length - 1)
                 ?  songIndex = _self.currentSongIndex + 1
                 : songIndex = 0;
 
-        changeSong(songIndex);
+        playSong(songIndex);
     }
 
     function bindEventHandlers() {