Updated templates to reflect upon changes in Django 1.5

I've removed/modifed the following calls from the templates, as they have either been significantly altered or depreciated in Django 1.5:

```bash
# Removed because: depreciated
{% load adminmedia %}

# Removed because: depreciated
{{ ADMIN_URL }}
# Replaced with:
{{ STATIC_URL }}

# Removed because: invalid syntax
{% url ARGUMENT %}
# Replaced with:
{% url "ARGUMENT" %}
```

Note: These were only updated as the "Mailchimp Logs" admin panel templates completely fail to load without the above changes.