With the plumber-curl.php i get this :
SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
That looks confusing.

So the SSL Certificate of Faucetbox is broken?
I suppose this is because they moved to cloudflare (it is reverse proxy).
Adding:
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
To
libs/faucetbox.php
Somewhere between:
$ch = curl_init($this->api_base . $method);
and
$response = json_decode(curl_exec($ch), true);
Should make your faucet work.
And hope they will find some time to give us an official "how to".
Plumber FB Diagnostic Tool 0.9b by NeedIfFindIt
PHP Version: 5.4.31
OPENSSL Version: OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
allow_url_fopen: Success
DNS Response: 104.28.29.86
--- Trying FSOCKOPEN - HTTP ---
Success
--- Trying FSOCKOPEN - HTTPS - IP method ---
Success
--- Trying FSOCKOPEN - HTTPS - gethostbyname method ---
Success
--- Trying FSOCKOPEN - HTTPS ---
Success
the curl one i got¨this
SSL peer certificate or SSH remote key was not OK
Looks like you have the same issue.