There are couple of fixes in the documentation that will show up in the next commit.
The coin daemon needs to run with the daemon option. Either add the option "daemon=1" in the daemon configuration file or run the daemon with the --daemon switch.
It has become habit for me to always run the coin daemons with the switch which is why I overlooked it in the documentation.

The apache2 http proxy module is actually called proxy_http. The command to activate it should read: a2enmod proxy_http. In the instructions I refer to it incorrectly as http_proxy.