Mobile optimization

* adds table-responsive class to BaseClass
* adds html meta attributes for proper small device rendering

templates/base.html

@@ -3,6 +3,7 @@
 <html lang="{{ language }}">
 <head>
     <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>{{ base_title }}</title>
     {% bootstrap_css %}
     {% bootstrap_javascript jquery='full' %}