title: 'Settings' object has no attribute 'RECAPTCHA_SECRET_KEY'
body: <p>I got this Error when user want to register:</p>
  
  <pre><code>AttributeError at /accounts/register/'
  
  'Settings' object has no attribute 'RECAPTCHA_SECRET_KEY'
  
  Request Method: POST
  Request URL:    http://127.0.0.1:8009/accounts/register/
  
  Django Version: 1.11.3
  Exception Type: AttributeError
  Exception Value:    
  'Settings' object has no attribute 'RECAPTCHA_SECRET_KEY'
  
  Exception Location: /home/ali/bestoon/.venv/local/lib/python2.7/site-packages/django/conf/__init__.py in __getattr__, line 57
  
  Python Executable:  /home/ali/bestoon/.venv/bin/python
  
  Python Version: 2.7.12
  Python Path:    
  ['/home/ali/bestoon/bestoon',
   '/home/ali/bestoon/.venv/lib/python2.7',
   '/home/ali/bestoon/.venv/lib/python2.7/plat-x86_64-linux-gnu',
   '/home/ali/bestoon/.venv/lib/python2.7/lib-tk',
   '/home/ali/bestoon/.venv/lib/python2.7/lib-old',
   '/home/ali/bestoon/.venv/lib/python2.7/lib-dynload',
   '/usr/lib/python2.7',
   '/usr/lib/python2.7/plat-x86_64-linux-gnu',
   '/usr/lib/python2.7/lib-tk',
   '/home/ali/bestoon/.venv/local/lib/python2.7/site-packages',
   '/home/ali/bestoon/.venv/lib/python2.7/site-packages']
  </code></pre>