title: Django REST framework IntegerField max_length issue
body: <p>I am getting an "<code>__init__()</code> got an unexpected keyword argument 'max_length'" error for my model field of IntegerField with max_length. The stack trace is as follows:</p>
  
  <pre><code>Environment:
  
  
  Request Method: GET
  Request URL: http://localhost:8000/api/jmc/foundation/
  
  Django Version: 1.7.1
  Python Version: 2.7.8
  Installed Applications:
  ('django.contrib.admin',
   'django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'dajaxice',
   'dajax',
   'rest_framework',
   'core',
   'analytics',
   'api')
  Installed Middleware:
  ('django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'django.middleware.clickjacking.XFrameOptionsMiddleware')
  
  
  Traceback:
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
    111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/csrf.py" in wrapped_view
    57.         return view_func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in view
    69.             return self.dispatch(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
    406.             response = self.handle_exception(exc)
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/views.py" in dispatch
    403.             response = handler(request, *args, **kwargs)
  File "/home/dev/Documents/Program Codes/Python/Django/Hera/api/views.py" in get
    17.         return Response(serializer.data)
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in data
    547.         ret = super(ListSerializer, self).data
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in data
    174.                 self._data = self.to_representation(self.instance)
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in to_representation
    500.             self.child.to_representation(item) for item in iterable
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in to_representation
    382.         fields = [field for field in self.fields.values() if not field.write_only]
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in fields
    245.             for key, value in self.get_fields().items():
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/serializers.py" in get_fields
    911.             ret[field_name] = field_cls(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/rest_framework/fields.py" in __init__
    597.         super(IntegerField, self).__init__(**kwargs)
  
  Exception Type: TypeError at /api/jmc/foundation/
  Exception Value: __init__() got an unexpected keyword argument 'max_length'
  </code></pre>