Move Django requirement into separate file to enable tox testing.

circle.yml

@@ -27,6 +27,7 @@ dependencies:
     # dependency on a version range of pbr.
     # Install a version which falls within that range.
     - pip install  --exists-action w pbr==0.9.0
+    - pip install --exists-action w -r requirements/edx/django.txt
     - pip install --exists-action w -r requirements/edx/base.txt
     - pip install --exists-action w -r requirements/edx/paver.txt
     - pip install --exists-action w -r requirements/edx/testing.txt

pavelib/prereqs.py

@@ -26,6 +26,7 @@ PYTHON_REQ_FILES = [
     'requirements/edx/pre.txt',
     'requirements/edx/github.txt',
     'requirements/edx/local.txt',
+    'requirements/edx/django.txt',
     'requirements/edx/base.txt',
     'requirements/edx/paver.txt',
     'requirements/edx/development.txt',

requirements/edx/base.txt

@@ -34,7 +34,6 @@ django-statici18n==1.4.0
 django-storages==1.4.1
 django-method-override==0.1.0
 django-user-tasks==0.1.5
-django==1.8.18
 django-waffle==0.12.0
 djangorestframework-jwt==1.11.0
 enum34==1.1.6

requirements/edx/django.txt

+Django==1.8.18

requirements/monitoring/requirements.txt

@@ -9,6 +9,7 @@
 
 # Requirements for the web application
 -r ../edx/pre.txt
+-r ../edx/django.txt
 -r ../edx/base.txt
 -r ../edx/local.txt
 -r ../edx/github.txt