added pooling

Procfile

-web: gunicorn wsgi:application
+web: gunicorn wsgi:application -b 0.0.0.0:$PORT -w 8
 worker: python manage.py celeryd -E -B --beat
\ No newline at end of file

requirements.txt

@@ -17,3 +17,4 @@ dj_database_url==0.2.2
 django-sslify==0.2
 django_webtest==1.7.5
 webtest==2.0.7
+django-db-pool==0.0.10

settings.py

@@ -28,6 +28,8 @@ DATABASES = {
 if get_from_env('DATABASE_URL', None):
     import dj_database_url
     DATABASES['default'] =  dj_database_url.config()
+    DATABASES['default']['ENGINE'] = 'dbpool.db.backends.postgresql_psycopg2'
+    DATABASES['default']['OPTIONS'] = {'MAX_CONNS': 1}
 
 # Local time zone for this installation. Choices can be found here:
 # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name