title: ImportError: cannot import name RemovedInDjango19Warning
body: <p>I'm on Django 1.8.7 and I've just installed Django-Allauth by cloning the repo and running pip install in the app's directory in my webapp on the terminal. Now when I run manage.py migrate, I get this error: </p>
  
  <pre><code>➜src git:(master) ✗ python manage.py migrate
      Traceback (most recent call last):
        File "manage.py", line 8, in &lt;module&gt;
          from django.core.management import execute_from_command_line
        File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 10, in &lt;module&gt;
          from django.apps import apps
        File "/Library/Python/2.7/site-packages/django/apps/__init__.py", line 1, in &lt;module&gt;
          from .config import AppConfig
        File "/Library/Python/2.7/site-packages/django/apps/config.py", line 6, in &lt;module&gt;
          from django.utils.module_loading import module_has_submodule
        File "/Library/Python/2.7/site-packages/django/utils/module_loading.py", line 4, in &lt;module&gt;
          from importlib import import_module
        File "/Library/Python/2.7/site-packages/django/utils/importlib.py", line 6, in &lt;module&gt;
          from django.utils.deprecation import RemovedInDjango19Warning
      ImportError: cannot import name RemovedInDjango19Warning
      ➜  src git:(master) ✗ 
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/6xeIw.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6xeIw.png" alt="enter image description here"></a></p>
  
  <p>I've checked and I'm still on django 1.8.7 so it wasn't accidently upgraded.</p>