title: Django-firebird can not work
body: <p>I downloaded the folder and put it into <code>C:\Python27\Lib\site-packages\django\contrib\gis\db\backends\firebird</code>,but when I use it,give me a </p>
  
  <pre><code>error:django.core.exceptions.ImproperlyConfigured: 'firebird' isn't an available database backend.
  Try using `django.db.backends.XXX, where XXX is one of:
      'dummy', 'mysql', 'oracle', 'postgresql_psycopg2', 'sqlite3'
  Error was: No module named firebird.base
  </code></pre>
  
  <p>I have already write the path into <code>PYTHONPATH</code>.</p>
  
  <p>How can I get this to work?</p>