Fix for Facebook's changed API, and removed test print statement

fbchat/client.py

@@ -292,7 +292,7 @@ class Client(object):
             self.ttstamp += str(ord(i))
         self.ttstamp += '2'
         # Set default payload
-        self.payloadDefault['__rev'] = int(r.text.split('"revision":',1)[1].split(",",1)[0])
+        self.payloadDefault['__rev'] = int(r.text.split('"client_revision":',1)[1].split(",",1)[0])
         self.payloadDefault['__user'] = self.uid
         self.payloadDefault['__a'] = '1'
         self.payloadDefault['ttstamp'] = self.ttstamp
@@ -962,8 +962,6 @@ class Client(object):
         # Make list of users unique
         user_ids = set(user_ids)
 
-        print(user_ids)
-
         for i, user_id in enumerate(user_ids):
             if user_id == self.uid:
                 log.warning('Error when adding users: Cannot add self to group chat')