change grunt task to karma:saucelabs and remove qunit

@@ -119,7 +119,8 @@ module.exports = function(grunt) {
       },
 
       dev: {
-          browsers: ['Chrome', 'Safari', 'Firefox', 'Opera', 'IE', 'PhantomJS', 'ChromeCanary'],
+        browsers: ['Chrome', 'Safari', 'Firefox',
+        'Opera', 'IE', 'PhantomJS', 'ChromeCanary'],
         configFile: 'test/localkarma.conf.js',
         autoWatch: true
       },
@@ -259,8 +260,7 @@ module.exports = function(grunt) {
                       'concat',
                       'uglify']);
 
-  grunt.registerTask('test', 
-                      ['manifests-to-js', 'qunit', 'karma']);
+  grunt.registerTask('test', ['manifests-to-js', 'karma:saucelabs']);
 
   // travis build task
   grunt.registerTask('build:travis', ['jshint', 'test:node', 'test:sauce-browser']);