Only show red strip if logged in

Mainly because the red/beta orange/blue combo looks gross. And also
because you’re not in admin mode until you’re logged in.

app/templates/admin_template.html

@@ -5,9 +5,11 @@
   <!--[if gt IE 8]><!-->
   <link rel="stylesheet" media="screen" href="{{ asset_url('stylesheets/main.css') }}" />
   <!--<![endif]-->
+  {% if current_user.is_authenticated %}
   <style>
-    #global-header-bar { background-color: {{header_colour}} }
+      #global-header-bar { background-color: {{header_colour}} }
   </style>
+  {% endif %}
   <!--[if IE 6]>
   <link rel="stylesheet" media="screen" href="{{ asset_url('stylesheets/main-ie6.css') }}" />
   <![endif]-->