Add initial support for viewing server index and controlling power

Only a few tears were shed in this process.
\Unirest::timeout(5); was added to core.php to prevent these tears in
the future. We have also leanred an important lesson about PHP: case
sensitivity in variables can lead to hours or tearing out hair only to
discover that $this->node->gsd_Listen should be
$this->node->gsd_listen. Thansk to @LordRalex for wiping up these tears.