title: Flask-Security example does not work
body: <p>I edited the app.py file to only use MongoDB through MongoEngine(you get to choose MongoDB or SQL). This is the output when I try to run my app:</p>
  
  <pre><code>    Familys-imac:flask-security Paul-Arthur$ python app.py
      Traceback (most recent call last):
        File "app.py", line 17, in &lt;module&gt;
          from flask.ext.security.datastore import MongoEngineUserDatastore
        File "/Library/Python/2.7/site-packages/flask/exthook.py", line 86, in load_module
          raise ImportError('No module named %s' % fullname)
      ImportError: No module named flask.ext.security.datastore.MongoEngineUserDatastore
  </code></pre>
  
  <p>This to me seams to suggest that there is a problem with the MongoEngine (please note that this is in a virtualenv).</p>
  
  <p>I therefor try to re-install the package, thinking that this might be the problem but I have no luck with that too. Output seams perfectly normal, what is happening?</p>
  
  <pre><code>    familys-imac:flask-security Paul-Arthur$ pip install MongoEngine
      Requirement already satisfied (use --upgrade to upgrade): MongoEngine in /Library/Python/2.7/site-packages
      Requirement already satisfied (use --upgrade to upgrade): pymongo in /Library/Python/2.7/site-packages (from MongoEngine)
      Cleaning up...
  </code></pre>