title: Karma proxies are not working
body: <p>I am using <strong>Karma (v0.12.37)</strong> as test runner along with <strong>JSPM (v0.16.2)</strong>. I have added following proxy config in karma so as to allow proper loading of JSPM files:</p>
  
  <pre><code>proxies: {
      '/base/jspm_packages/': '/base/app/jspm_packages/'
  }
  </code></pre>
  
  <p>Bu this doesn't work out and fails on following:</p>
  
  <pre><code>PhantomJS 2.0.0 (Windows 8 0.0.0) ERROR: 'Potentially unhandled rejection [10] Error: XHR error loading http://localhost:9876/base/jspm_packages/npm/babel-core@5.8.22.js
          Error loading http://localhost:9876/base/jspm_packages/npm/babel-core@5.8.22.js
          Error loading http://localhost:9876/base/app/pages/examples/todo-example/todo.controller.test.js'
  </code></pre>
  
  <p>Debug Logs are giving:</p>
  
  <pre><code>proxying request - /base/jspm_packages/npm/babel-core@5.8.22.js to localhost:9876
  /base/app/jspm_packages/npm/babel-core@5.8.22.js { host: 'localhost',
    port: 9876,
    baseProxyUrl: '/base/app/jspm_packages/',
    https: false }
  </code></pre>
  
  <p>But the following url containing 'app' in it works properly:</p>
  
  <p>http ://localhost:9876/base/ <strong>app/</strong> jspm_packages/npm/babel-core@5.8.22.js</p>
  
  <p>Any clue on what is going wrong?</p>