title: Include jQuery into Symfony2
body: <p>I am new in Symfony2 framework and not fully understand how to work with javascripts and how to include theirs in the best way.</p>
  
  <p>What I need: to include jQuery script to each page.</p>
  
  <p>What I have: I have common layout like this:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
      &lt;head&gt;
          {% block javascripts %}{% endblock %}
      &lt;/head&gt;
      &lt;body&gt;
          {% block body %}{% endblock %}
  
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Where jquery.js should be placed. What about <strong>web/bundles/jquery</strong>? Or there are some special official jquery bundles? Should I use asset() and how?</p>