Updated the docs_requirements file, fixes #624.

Author: mboersma

docs/docs_requirements.txt

@@ -2,13 +2,15 @@
 boto==2.23.0
 celery==3.1.8
 Django==1.6.2
+django-allauth==0.15.0
 django-guardian==1.1.1
 django-json-field==0.5.5
 djangorestframework==2.3.12
 dop==0.1.4
-etcd==2.0.1
+gunicorn==18.0
 paramiko==1.12.1
 pyrax==1.6.2
+python-etcd=0.3.0
 PyYAML==3.10
 
 # Deis client requirements