title: FieldFile object has no attribute 'startswith'
body: <p>I'm testing out a few options. I have uploaded a file using django-storages with S3 and it works fine. However, when I try and read the file with the code below I get the following error:</p>
  
  <blockquote>
    <p>'FieldFile' object has no attribute 'startswith'</p>
  </blockquote>
  
  <p><strong>Why?</strong></p>
  
  <p>Even default_storage.exists(self.filepath) give the same error.</p>
  
  <pre><code> csv_file = default_storage.open(self.filepath, 'r')
  
  
   new_object = CSVImport(csvfile=csv_file.read(),
                          model=Contact,
                          modelspy=".",
                          mappings="1=first_name,2=mobile,3=email,4=last_name,5=43,6=16")
  
   new_object.run()
  </code></pre>
  
  <p><strong>Full Error:</strong></p>
  
  <pre><code>Environment:
  
  
  Request Method: POST
  Request URL: http://127.0.0.1:8000/contacts/upload/configurator/95/
  
  Django Version: 1.5.1
  Python Version: 2.7.2
  Installed Applications:
  ('django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.sites',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'django.contrib.admin',
   'django.contrib.humanize',
   'django.contrib.sitemaps',
   'south',
   'userena',
   'social_auth',
   'djcelery',
   'storages',
   'endless_pagination',
   'django.contrib.flatpages',
   'django_sagepay',
   'guardian',
   'widget_tweaks',
   'badger',
   'tastypie',
   'accounts',
   'contacts',
   'sms',
   'smartpages',
   'django_sagepay',
   'unsubscribe',
   'core',
   'django_nose',
   'debug_toolbar')
  Installed Middleware:
  ('dogslow.WatchdogMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'async_messages.middleware.AsyncMiddleware',
   'core.middleware.ssl.SSLRedirect',
   'core.middleware.account.RefreshBalance',
   'debug_toolbar.middleware.DebugToolbarMiddleware')
  
  
  Traceback:
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
    115.                         response = callback(request, *callback_args, **callback_kwargs)
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
    25.                 return view_func(request, *args, **kwargs)
  File "/Users/user/Documents/workspace/t/contacts/views.py" in upload_configurator
    201.             process_upload_Temp(upload_id=upload.id, cleaned_data=data)
  File "/Users/user/Documents/workspace/t/contacts/views.py" in process_upload_Temp
    222.     upload.process(cleaned_data=cleaned_data)
  File "/Users/user/Documents/workspace/t/contacts/models.py" in process
    169.         csv_file = default_storage.open(self.filepath, 'r')
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/site-packages/django/core/files/storage.py" in open
    36.         return self._open(name, mode)
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/site-packages/storages/backends/s3boto.py" in _open
    237.         name = self._normalize_name(self._clean_name(name))
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/site-packages/storages/backends/s3boto.py" in _clean_name
    204.         return os.path.normpath(name).replace('\\', '/')
  File "/Users/user/Documents/workspace/t/django-env/lib/python2.7/posixpath.py" in normpath
    318.     initial_slashes = path.startswith('/')
  
  Exception Type: AttributeError at /contacts/upload/configurator/95/
  Exception Value: 'FieldFile' object has no attribute 'startswith'
  
  
  I have tried:
  
  csv_file.read() gives same error.
  
  Full Error details:
  </code></pre>