Fix the instance data is empty (#54)

* Fix the instance data is empty

* Change grpc tools version

* Change to build os

.travis.yml

 sudo: required
 
+os: osx
+
 language: node_js
 
 node_js:

modules/nodejs-agent/lib/services/register-service.js

@@ -101,7 +101,8 @@ RegisterService.prototype.launch = function() {
         sendHeartBeat = function(serviceId, instanceID, callback) {
             async.forever(function(next) {
                 setTimeout(function() {
-                    that._serviceManager.remoteClientService().sendHeartBeat(instanceID);
+                    logger.info("RegisterService", "The Service[%s, %d] send heart beat to Collector.", agentConfig.getServiceName(), agentConfig.getInstanceId());
+                    that._serviceManager.remoteClientService().sendHeartBeat(agentConfig.getInstanceId());
                     next();
                 }, 3 * 60 * 1000);
             }, function(err) {

modules/nodejs-agent/package.json

@@ -49,7 +49,7 @@
     "eslint": "^4.19.1",
     "eslint-config-google": "^0.9.1",
     "eslint-plugin-header": "^1.2.0",
-    "grpc-tools": "^1.6.6",
+    "grpc-tools": "1.7.1",
     "mysql": "^2.15.0",
     "require-self": "^0.2.1",
     "run-script-os": "^1.0.3"