Merge develop to master for release

example environment file.

balance_tracker/balance_tracker_nginx.conf

-#
-# Homepage and endpoints of the API "HAF Block Explorer".
-#
-worker_processes  5;
-error_log /dev/stdout info;
-worker_rlimit_nofile 8192;
-
-events {
-  worker_connections 4096;
-}
-http {
-    access_log /dev/stdout;
-    server {
-            listen 0.0.0.0:80 default_server;
-            server_name _;
-
-            location / {
-                    include rewrite_rules.conf;
-                    rewrite_log on;
-
-                    proxy_pass  http://balance-tracker-postgrest:3000;  # my PostREST is  here!
-
-                    proxy_set_header Host $host;
-                    proxy_set_header X-Real-IP $remote_addr;
-                    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-                    #default_type;
-                    proxy_hide_header Content-Location;
-                    proxy_set_header  Connection "";
-                    proxy_http_version 1.1;
-            }
-    }
-}