Fix loading audio and video with blob urls

Passing a blob url as the second parameter to `this.load.audio` or
`this.load.video` would cause Phaser to load a different url.
Additionally, `this.load.path` would incorrectly be prepended to the
url.

`AudioFile.getAudioURL` and `VideoFile.getVideoURL`, are expected to
return an object with two properties; url and type. However when passed
a blob url they return a string. The return value's
`url` property is inspected to get the url. For strings' the property is
`undefined`. If the url property is undefined then a url derived from
the asset key is used instead.

src/loader/File.js

@@ -94,7 +94,7 @@ var File = new Class({
         {
             this.url = loader.path + loadKey + '.' + GetFastValue(fileConfig, 'extension', '');
         }
-        else if (typeof(this.url) !== 'function')
+        else if (typeof(this.url) !== 'function' && this.url.indexOf('blob:') !== 0 && this.url.indexOf('data:') !== 0)
         {
             this.url = loader.path + this.url;
         }

src/loader/filetypes/AudioFile.js

@@ -145,7 +145,10 @@ AudioFile.getAudioURL = function (game, urls)
 
         if (url.indexOf('blob:') === 0 || url.indexOf('data:') === 0)
         {
-            return url;
+            return {
+                url: url,
+                type: ''
+            };
         }
 
         var audioType = url.match(/\.([a-zA-Z0-9]+)($|\?)/);

src/loader/filetypes/VideoFile.js

@@ -261,7 +261,10 @@ VideoFile.getVideoURL = function (game, urls)
 
         if (url.indexOf('blob:') === 0)
         {
-            return url;
+            return {
+                url: url,
+                type: ''
+            };
         }
 
         var videoType;