[Ref]: Prefix «YT_» added to enumeration YTRestMethod
[Ref]: Removed useless initialization with nil
[Ref]: Splitted method for two - first one receives NSData, second one makes JSON from NSData
[Fix]: Removed suffix «Is» from parameter names
[Fix]: Removed suffix «Is» from parameter names 2
[Mod]: Fixed suffixes «Is», renamed dispatch queue, removed useless initialization