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 %}
Server error
{% endblock %}

{% block content %}
<h2>Oops ...</h2>
<p>
  The server encountered an internal error. If the problem persists,
  please let us know.
</p>
{% endblock %}