Remove scheme and any trailing slashes from meta schema key

Author: lcvisser

Diff for: jsonschema/_utils.py

@@ -12,7 +12,10 @@ class URIDict(MutableMapping):
     """
 
     def normalize(self, uri):
-        return urlsplit(uri).geturl()
+        components = urlsplit(uri)
+        netloc = components.netloc
+        path = re.sub(r"[/]+$", "", components.path)
+        return netloc + path
 
     def __init__(self, *args, **kwargs):
         self.store = dict()