Integrate with cloud (#1201)

* update default url for services

* fix npe

* spotlesS

* revert gradle properties

* Add getter for httpservice url, now that it may not be exposed by default to users

core/src/main/java/org/web3j/protocol/http/HttpService.java

@@ -223,6 +223,10 @@ public HashMap<String, String> getHeaders() {
         return headers;
     }
 
+    public String getUrl() {
+        return url;
+    }
+
     @Override
     public void close() throws IOException {}
 }