fixed configuration path

src/main/java/org/gcube/gcat/client/Configuration.java

@@ -16,12 +16,12 @@ public class Configuration extends GCatClient implements org.gcube.gcat.api.inte
 	protected ObjectMapper mapper;
 	
 	public Configuration() throws MalformedURLException {
-		super(CONFIGURATION);
+		super(CONFIGURATIONS);
 		mapper = new ObjectMapper();
 	}
 	
 	public Configuration(URL enforcedServiceURL) throws MalformedURLException {
-		super(enforcedServiceURL, CONFIGURATION);
+		super(enforcedServiceURL, CONFIGURATIONS);
 		mapper = new ObjectMapper();
 	}