Add nginx config

This is not yet hooked up to Puppet.

(imported from commit 1d0368285a5a9ef5a4af0651001db4930cf77578)

servers/puppet/files/nginx/sites-available/humbug

@@ -0,0 +1,53 @@
+server {
+    listen 80;
+    server_name app.humbughq.com;
+    return 301 https://$server_name$request_uri;
+}
+
+server {
+    listen 443;
+
+    ssl on;
+    ssl_certificate /etc/ssl/certs/app.humbughq.com.combined-chain.crt;
+    ssl_certificate_key /etc/ssl/private/app.humbughq.com.key;
+
+    server_name app.humbughq.com;
+    access_log /var/log/nginx/humbug.access.log;
+    error_log /var/log/nginx/humbug.error.log;
+
+    # Enable HSTS: tell browsers to always use HTTPS
+    add_header Strict-Transport-Security max-age=15768000;
+
+    # Avoid clickjacking attacks
+    add_header X-Frame-Options DENY;
+
+    # Serve a custom error page when the app is down
+    error_page 502 503 504 /static/public/html/5xx.html;
+
+    # Serve static files directly
+    location /static/ {
+        alias /home/humbug/humbug/zephyr/static-access-control/;
+        expires 30d;
+    }
+
+    # Send longpoll requests to Tornado
+    location ~ /json/get_updates|/api/v1/get_messages {
+        proxy_pass       http://localhost:9993;
+        proxy_redirect   off;
+
+        # Needed for longpolling
+        proxy_buffering  off;
+        proxy_read_timeout 1200;
+
+        proxy_set_header Host            $host;
+        proxy_set_header X-Real-IP       $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+
+    # Send everything else to Django via FastCGI
+    location / {
+        include fastcgi_params;
+        fastcgi_pass unix:/home/humbug/humbug/fastcgi-socket;
+        fastcgi_split_path_info ^()(.*)$;
+    }
+}