added template macros

ordr2/templates/macros.jinja2

@@ -0,0 +1,14 @@
+{% macro flash_messages() -%}
+    {% for queue in ('ok', 'warning', 'error') %}
+        {% for message in request.session.pop_flash(queue) %}
+            {% set css_class = 'danger' if queue == 'error' else queue %}
+            <div class="alert alert-{{ css_class }} role="alert">
+                {{message|safe}}
+            </div>
+        {% endfor %}
+    {% endfor %}
+{%- endmacro %}
+
+{% macro center_column_hack() -%}
+    </div><div class="col-2"></div>
+{%- endmacro %}