Add support for flashing messages

uitwww/templates/layout.html

@@ -84,6 +84,17 @@
         {% endfor %}
 
         <div class="container">
+            {% with messages = get_flashed_messages(with_categories=True) %}
+                {% if messages %}
+                    {% for category, message in messages %}
+                        <div class="alert {% if category != "message" %}{{ category }}{% else %}info{% endif %}">
+                            {{ message }}
+                            <span class="close">&times;</span>
+                        </div>
+                    {% endfor %}
+                {% endif %}
+            {% endwith %}
+
             {% block content %}{% endblock %}
 
             <footer>