Fixes #148 making log messages works when firebug is opened after the page was loaded on Firefox

misc/js/pushstream.js

@@ -158,8 +158,7 @@ Authors: Wandenberg Peixoto <wandenberg@gmail.com>, Rogério Carvalho Schneider
     debug : function() { if  (PushStream.LOG_LEVEL === 'debug')                                         { Log4js._log.apply(Log4js._log, arguments); }},
     info  : function() { if ((PushStream.LOG_LEVEL === 'info')  || (PushStream.LOG_LEVEL === 'debug'))  { Log4js._log.apply(Log4js._log, arguments); }},
     error : function() {                                                                                  Log4js._log.apply(Log4js._log, arguments); },
-    _log  : function() {
-      if (!Log4js.logger) {
+    _initLogger : function() {
       var console = window.console;
       if (console && console.log) {
         if (console.log.apply) {
@@ -172,10 +171,21 @@ Authors: Wandenberg Peixoto <wandenberg@gmail.com>, Rogério Carvalho Schneider
           };
         }
       }
+    },
+    _log  : function() {
+      if (!Log4js.logger) {
+        Log4js._initLogger();
       }
 
       if (Log4js.logger) {
+        try {
           Log4js.logger.apply(window.console, arguments);
+        } catch(e) {
+          Log4js._initLogger();
+          if (Log4js.logger) {
+            Log4js.logger.apply(window.console, arguments);
+          }
+        }
       }
 
       var logElement = document.getElementById(PushStream.LOG_OUTPUT_ELEMENT_ID);