fix unrecognized Liquid javascript tag

Author: wehrlock

_includes/_scripts.html

@@ -1,5 +1,5 @@
 <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
-{% javascript main %}
+<script src="/assets/main.js"></script>
 {% if site.inc.sharing.twitter %}<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script>{% endif %}
 {% if site.inc.sharing.facebook %}<div id="fb-root"></div>
 <script>(function(d, s, id) {