Use jQuery UI styles to get slider CSS

This overrides the previous styles though which is undesirable.  Will
need some FED attention.

oscar/templates/oscar/dashboard/layout.html

@@ -6,6 +6,7 @@
 
 {% block mainstylesheet %}
     <link rel="stylesheet" href="{{ STATIC_URL }}oscar/css/dashboard.css" />
+    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.0/themes/base/jquery-ui.css" />
 {% endblock %}
 
 {% block title %}