fix(reporter.junit): Add browser log output to JUnit.xml

Make the JUnit adapter inherit from base
Push all log message into system-out element of the junit xml file.

Closes #302

lib/reporters/JUnit.js

@@ -3,17 +3,23 @@ var path = require('path');
 var fs = require('fs');
 var builder = require('xmlbuilder');
 
+var BaseReporter = require('./Base');
 var helper = require('../helper');
 var log = require('../logger').create('reporter');
 
 
 var JUnitReporter = function(formatError, outputFile, pkgName, emitter) {
+  var messageAdapter = function(msg) {
+    allMessages.push(msg);
+  };
+
+  BaseReporter.call(this, formatError, 0, messageAdapter);
+
   var xml;
   var suites;
   var pendingFileWritings = 0;
   var fileWritingFinished = function() {};
-
-  this.adapters = [];
+  var allMessages = [];
 
   this.onRunStart = function(browsers) {
     suites = {};
@@ -38,7 +44,7 @@ var JUnitReporter = function(formatError, outputFile, pkgName, emitter) {
     suite.att('failures', result.failed);
     suite.att('time', result.netTime / 1000);
 
-    suite.ele('system-out');
+    suite.ele('system-out').dat(allMessages.join() + '\n');
     suite.ele('system-err');
   };
 
@@ -63,7 +69,7 @@ var JUnitReporter = function(formatError, outputFile, pkgName, emitter) {
     suites = xml = null;
   };
 
-  this.onSpecComplete = function(browser, result) {
+  this.specSuccess = this.specSkipped = this.specFailure = function(browser, result) {
     var spec = suites[browser.id].ele('testcase', {
       name: result.description, time: result.time / 1000,
       classname: (pkgName ? pkgName + ' ' : '') + browser.name + '.' + result.suite.join(' ').replace(/\./g, '_')