Add configuration for nginx for breaking out API demos into their own package

bbb-api-demo/demo.nginx

+         # Forward request to /demo to tomcat.  This is for
+         # the BigBlueButton api demos.
+       location /demo {
+           proxy_pass         http://127.0.0.1:8080;
+           proxy_redirect     default;
+           proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+
+        # Allow 30M uploaded presentation document.
+           client_max_body_size       30m;
+           client_body_buffer_size    128k;
+
+           proxy_connect_timeout      90;
+           proxy_send_timeout         90;
+           proxy_read_timeout         90;
+
+           proxy_buffer_size          4k;
+           proxy_buffers              4 32k;
+           proxy_busy_buffers_size    64k;
+           proxy_temp_file_write_size 64k;
+
+           include    fastcgi_params;
+       }
+