Readded start>end checking. Template improvements

Added descritpions of all error for the user as well as the image.

Added contextual alert boxes for messages in base.

If  start>end start<=>end. Very simple fix, thanks Charlie.

templates/404.html

@@ -3,7 +3,11 @@
 {% block title %}Page Not Found{% endblock %}
 
 {% block content %}
-    <div class="text-center">
-        <img src="{% static 'imgs/404.jpg' %}"/>
+    <div class="col-sm-12">
+        <h1>404: Not Found</h1>
+
+        <div class="text-center">
+            <img src="{% static 'imgs/404.jpg' %}"/>
+        </div>
     </div>
 {% endblock %}