Add Gunicorn for production execution

pacmanager/pacmanager/settings.py

@@ -111,6 +111,7 @@ INSTALLED_APPS = (
     'django.contrib.staticfiles',
     'django.contrib.admin',
     'django.contrib.humanize',
+    'gunicorn',
     'south',
     'braces',
     'formtools',

requirements.txt

@@ -5,3 +5,4 @@ South==0.7.4
 -e git+https://github.com/disqus/django-modeldict.git#egg=modeldict
 psycopg2==2.4.5
 dj-database-url==0.2.0
+gunicorn=0.14.2