Update logger for es6 modules

lib/handlebars/base.js

@@ -153,15 +153,15 @@ function registerDefaultHelpers(instance) {
 
 var levels = {
   DEBUG: 0, INFO: 1, WARN: 2, ERROR: 3, level: 3
-}
+};
 
 var methodMap = { 0: 'debug', 1: 'info', 2: 'warn', 3: 'error' };
 
 export var logger = {
   // can be overridden in the host environment
   log: function(level, obj) {
-    if (Handlebars.logger.level <= level) {
-      var method = Handlebars.logger.methodMap[level];
+    if (logger.level <= level) {
+      var method = logger.methodMap[level];
       if (typeof console !== 'undefined' && console[method]) {
         console[method].call(console, obj);
       }
@@ -169,7 +169,7 @@ export var logger = {
   }
 };
 
-export function log(level, obj) { logger.log(level, obj); };
+export function log(level, obj) { logger.log(level, obj); }
 
 export var createFrame = function(object) {
   var obj = {};