Make the definition of EncodedVideo.url looser (so we can use it for YouTube IDs).

edxval/models.py

@@ -127,7 +127,7 @@ class EncodedVideo(models.Model):
     """
     created = models.DateTimeField(auto_now_add=True)
     modified = models.DateTimeField(auto_now=True)
-    url = models.URLField(max_length=200)
+    url = models.CharField(max_length=200)
     file_size = models.PositiveIntegerField()
     bitrate = models.PositiveIntegerField()