change docker to use port 8080 by default (#638)

* change docker to use default 8080 port

docker-entrypoint_light.sh

@@ -20,7 +20,7 @@ trap refresh HUP
 
 if ! which -- "${1}"; then
   # first arg is not an executable
-  node /usr/src/app/ -p 80 "$@" &
+  node /usr/src/app/ "$@" &
 	# Wait exits immediately on signals which have traps set. Store return value and wait
 	# again for all jobs to actually complete before continuing.
 	wait $! || RETVAL=$?