title: Why yeoman backbone app doesn't run in "dev" mode?
body: <p>I've just generated some backbone app using Yeoman and backbone-generator.</p>
  
  <pre><code>yo backbone --template-framework=handlebars
  </code></pre>
  
  <p>And made testView with some test template.
  After grunt build , if I launch app from dist directory, it works flawlessly.
  But when trying to see my app in "dev" mode using grunt serve it gives me error:</p>
  
  <pre><code>"GET http://localhost:9000/scripts/templates.js 404 (Not Found)"
  </code></pre>
  
  <p>Should it be so? If not, what is the possible problem I should look for?
  ATM google guided me only to similar issues.
  Running build every time is very time consuming.</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>Grunt serve gives error: </p>
  
  <pre><code>Warning: Unable to delete ".tmp" file (ENOTEMPTY, directory not empty...
  </code></pre>