title: Running grunt "concurrent:test" Aborted due to warnings
body: <p>I'm using a <strong>Yeoman angular generator</strong> and when I run this code I get grunt exiting with a warning. I'm running inside debian wheezy and have run these commands before running grunt:</p>
  
  <pre><code>sudo apt-get install ruby           &amp;&amp;
  sudo gem install sass compass       &amp;&amp;
  npm install                         &amp;&amp;
  sudo npm install -g grunt-cli       &amp;&amp;
  sudo npm install -g bower           &amp;&amp;
  </code></pre>
  
  <p>gruntfile.js:</p>
  
  <pre><code> grunt.registerTask('test', [
      'clean:server',
      'concurrent:test',
      'autoprefixer',
      'connect:test',
      'karma'
    ]);
  
   test: {
          options: {
            port: 9001,
            base: [
              '.tmp',
              'test',
              '&lt;%= yeoman.app %&gt;'
            ]
          }
        },
  </code></pre>
  
  <p>Warning:</p>
  
  <pre><code>Running "concurrent:test" (concurrent) task
      Warning:  Use --force to continue.
  
          Aborted due to warnings.
  
  
  Execution Time (2014-04-02 13:58:03 UTC)
  concurrent:test  1.1s  ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 99%
  Total 1.1s
  Process finished with exit code 6
  </code></pre>