Get,Post,GetImages method

The Class Method includes Get,Post,GetImages.+ (void)doGetWithUrl:(NSString *)url path:(NSString *)path params:(NSDictionary *)params callback:(BKHttpCallback) callback is Get method.+ (void)doPostWithUrl:(NSString *)url path:(NSString *)path params:(NSDictionary *)params callback:(BKHttpCallback)callback is Post method.These method is based on AFNetWorking.