added account page to change password and email address.

comic/templates/comic/settings_page.html

@@ -4,7 +4,10 @@
 
 {% block content %}
 {% if error_message %}
-<div class="alert alert-danger" role="alert">{{ error_message }}</div>
+<div class="alert alert-danger" role="alert">{{ error_message|safe }}</div>
+{% endif %}
+{% if success_message %}
+<div class="alert alert-success" role="alert">{{ success_message|safe }}</div>
 {% endif %}
 <form method="POST">
     {% csrf_token %}