Connectors Update
- rename HTTP connectors;
- HTTP connectors use only curl, composer package 'fguillot/json-rpc' was removed;
- in HttpJsonRpcConnectorAbstract/WSConnectorAbstract some properties was made static and to constructor added ordering node by timeout answer;
- close old connection before new for WSConnectorAbstract;
- to SteemitHttpJsonRpcConnector were added new nodes (6 total);
- new connector for GOLOS GolosHttpJsonRpcConnector;