Fix for fs url parsing so that credentials can contain an exclamation mark

fs/opener.py

@@ -119,8 +119,8 @@ class OpenerRegistry(object):
 :\/\/
 
 (?:
+(?:(.*?)@(.*?))
 |(.*?)
-|(?:(.*?)!)
 )
 
 (?:
@@ -129,7 +129,6 @@ class OpenerRegistry(object):
 ''', re.VERBOSE)    
     
      
-     
     def __init__(self, openers=[]):
         self.registry = {}
         self.openers = {}
@@ -181,7 +180,11 @@ class OpenerRegistry(object):
         match = self.split_segments(fs_url)
         
         if match:            
-            fs_name, fs_url, _, path = match.groups()
+            fs_name, credentials, url1, url2, path = match.groups()
+            if credentials:
+                fs_url = '%s@%s' % (credentials, url1)
+            else:
+                fs_url = url2
             path = path or ''
             fs_url = fs_url or ''
             if ':' in fs_name: