Change the function name for more appropriate.

Author: jinpingh

lib/post_data.js

@@ -465,12 +465,12 @@ RocketChatDataPostHandler.prototype.postData = function(data) {
 /*
   DefaultDataPostHandler.
 */
-function DefaultFormatter(robot, formatter) {
+function DefaultDataPostHandler(robot, formatter) {
   this.robot = robot;
   this.formatter = formatter;
 }
 
-DefaultFormatter.prototype.postData = function(data) {
+DefaultDataPostHandler.prototype.postData = function(data) {
   var recipient, split_message, formatted_message,
       text = "";
 
@@ -503,13 +503,13 @@ var dataPostHandlers = {
   'hipchat': HipchatDataPostHandler,
   'spark': SparkDataPostHandler,
   'rocketchat': RocketChatDataPostHandler,
-  'default': DefaultFormatter
+  'default': DefaultDataPostHandler
 };
 
 module.exports.getDataPostHandler = function(adapterName, robot, formatter) {
   if (!(adapterName in dataPostHandlers)) {
     robot.logger.warning(
-      util.format('No post handler found for %s. Using DefaultFormatter.', adapterName));
+      util.format('No post handler found for %s. Using DefaultDataPostHandler.', adapterName));
     adapterName = 'default';
   }
   robot.logger.debug(