Changed the designation for localhost in the mpd-scripts

The old designation was ::, since not all distros include this
for localhost, I changed :: to localhost.
This is to make everything more available on other distros.
Patched the mysql connection creation in server.js

The documentation states that you should use socketpath when
working with mysql socket files. Also state the database upon
creation instead of through a query.
Updated the mpd host for mpc

Just as with the scripts, the host had to be updated from
:: to localhost. This is for usability.
Added myself as an contributor in the footer

Since I've patched it, I saw it fitting to add myself to the
footer on the index page.
Added an example for hidden.php

I thought that an example was needed for hidden.php
This is so that a newcomer won't have to check the source
to get everything up and running.