title: django-pyodbc: Data source name not found, and no default driver specified
body: <p>I'm using Ubuntu 12.04 server, Django 1.5.5, pyodbc-3.0.7 and I am trying to connect to a MSSQL 2005 server. I've installed django-pyodbc through pip and modified my settings.py like so:</p>
  
  <pre><code> DATABASES = {
      'default': {
          'ENGINE': 'django_pyodbc', 
          'NAME': 'db_name',                     
          'USER': 'user_name',                    
          'PASSWORD': 'password',              
          'HOST': 'AB131\A_INS01',                  
          'PORT': '',                    
          'OPTIONS': {
             'host_is_server': True
          },
      }
  }
  </code></pre>
  
  <p>But when I try to run syncdb I get:</p>
  
  <pre><code> Error: ('IM002', '[IM002] [unixODBC][Driver Manager]Data source name not found, and no default driver specified (0) (SQLDriverConnect)')
  </code></pre>
  
  <p>The ODBC driver installed on the Windows machine is:</p>
  
  <pre><code>  SQL Server 6.01.7601.17514 SQLSRV32.DLL
  </code></pre>
  
  <p>What else do I need to do? Are there any other drivers that I need to install on either the Linux or Windows machine?</p>