Changes required for Domain Shared Contacts

src/atom/service.py

@@ -181,7 +181,8 @@ class AtomService(object):
       if content_length:
         all_headers['Content-Length'] = str(content_length)
 
-    all_headers['GData-Version'] = '2.0'
+    if 'GData-Version' not in all_headers:  
+      all_headers['GData-Version'] = '2.0'
     # Find an Authorization token for this URL if one is available.
     if self.override_token:
       auth_token = self.override_token

src/gdata/service.py

@@ -233,7 +233,7 @@ class GDataService(atom.service.AtomService):
           and remove_token.
     """
     atom.service.AtomService.__init__(self, http_client=http_client, 
-        token_store=token_store)
+        additional_headers=additional_headers, token_store=token_store)
     self.email = email
     self.password = password
     self.account_type = account_type