Adds HTML5 audio embed support for .mp3 links

Code clean up (removed H5P embed test)

src/sidebar/media-embedder.js

@@ -102,6 +102,7 @@ var embedGenerators = [
     return null;
   },
 
+  // Matches URLs that have .mp3 in them (assumed to be audio files)
   function html5audioFromMp3Link(link) {
 	if (link.href.toLowerCase().indexOf('.mp3') !== -1) {
 	  return mp3audio(link.href);
@@ -109,12 +110,6 @@ var embedGenerators = [
    return null;
   },
 
-  function h5pFromEmbedLink(link) {
-  	if (link.href.toLowerCase().indexOf('admin-ajax.php?action=h5p_embed&id=') !== -1) {
-  		return iframe(link.href);
-  	}
-  	return null;
-  }
 ];
 
 /**

src/sidebar/test/media-embedder-test.js

@@ -109,13 +109,6 @@ describe('media-embedder', function () {
     }); 
   })
 
-/**  it('replaces H5P activity links with iframes', function(){
-*    var urls = [
-*      'https://h5p.org/h5p/embed/617'
-*    ]
-*  }
-*/
-
   it('does not replace links if the link text is different', function () {
     var url = 'https://youtu.be/QCkm0lL-6lc';
     var element = domElement('<a href="' + url + '">different label</a>');
@@ -169,4 +162,4 @@ describe('media-embedder', function () {
     assert.equal(
       element.children[1].src, 'https://www.youtube.com/embed/abcdefg');
   });
-});
\ No newline at end of file
+};
\ No newline at end of file