Add files necessary for production deployment

* Dockerfile, docker-compose template
* nginx config
* uwsgi config
* wait-for-postgres script
* requirements.txt
* Some other stuff

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

scripts/wait-for-postgres.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+# Hang until Postgres has started up.
+set -e
+
+host="$1"
+shift
+
+until PGPASSWORD="$POSTGRES_PASSWORD" psql -h "$host" -U "$POSTGRES_USER" -c '\q'; do
+  sleep 1
+done
+
+exec "$@"