title: Error on Configuring Django-oauth-plus
body: <p>I am getting a <strong>400 error</strong> when i try the example in the <a href="http://code.larlet.fr/django-oauth-plus/wiki/Home" rel="nofollow">docs</a></p>
  
  <pre><code>settings.py
  INSTALLED_APPS = (
  'oauth_provider',
  'django.contrib.auth',
  )
  
  OAUTH_SIGNATURE_METHODS = ['hmac-sha1',]
  </code></pre>
  
  <p>And when i do this</p>
  
  <pre><code>&gt;&gt;&gt; from oauth_provider.models import Resource, Consumer
  &gt;&gt;&gt; resource = Resource(name='photos', url='/oauth/photo/')
  &gt;&gt;&gt; resource.save()
  &gt;&gt;&gt; CONSUMER_KEY = 'dpf43f3p2l4k3l03'
  &gt;&gt;&gt; CONSUMER_SECRET = 'kd94hf93k423kf44'
  &gt;&gt;&gt; consumer = Consumer(key=CONSUMER_KEY, secret=CONSUMER_SECRET,
  ...                     name='http://127.0.0.1:9000', user=jane)
  &gt;&gt;&gt; consumer.save()
  
  
  &gt;&gt;&gt; from django.test.client import Client
  &gt;&gt;&gt; c = Client()
  
  &gt;&gt;&gt; import time
  &gt;&gt;&gt; parameters = {
  ...     'oauth_consumer_key': CONSUMER_KEY,
  ...     'oauth_signature_method': 'PLAINTEXT',
  ...     'oauth_signature': '%s&amp;' % CONSUMER_SECRET,
  ...     'oauth_timestamp': str(int(time.time())),
  ...     'oauth_nonce': 'requestnonce',
  ...     'oauth_version': '1.0',
  ...     'oauth_callback': 'http://127.0.0.1:9000/request_token_ready',
  ...     'scope': 'photos', 
  ... }
  &gt;&gt;&gt; response = c.get("/oauth/request_token/", parameters)
  &gt;&gt;&gt; response.status_code
  
      400
  </code></pre>
  
  <p>Am i missing something in the configuration? I cannot find a good documentation on how to do this?</p>