Updated snippet's template and views files to fix rating code collision which prevented posting new snippets. Updated snippet's models file so that now secret id of each snippet will be unique. It also means that the no two or more than two snippets will have same secret id.

{% extends "base.djhtml" %}

{% block title %}
Page not found
{% endblock %}

{% block content %}
<h1>Page not found</h1>
<p>
  The page you were looking for is unavailable. If you think this
  is our fault, please let us know.
</p>
{% endblock %}