Django1.5 Updates

Updating Hatband for compatibility with Django 1.5. Issues addressed:

* Changes to the URL templatetag which require wrapping string arguments in quotes
  * Wrapped all strings passed to the URL template tag in quotes
  * Importing URL from the future library to allow backwards compatibility with Django 1.3
* The removal of ADMIN_MEDIA_PREFIX in favor of the static tag
  * Created template tag which mimics the ADMIN_MEDIA_PREFIX tag in Django 1.3 but mimics a call to {% static 'admin/' %} (from staticfiles, not the default) in later Django versions.