Changed serverside to function more like an api

I don't know whether I'm going to use JS to enctypt, since the securety
is questionable, thus I've updated server/index.php to act more like an
API, you can call to get your API-keys.
Added GitHub logo to index.html
Played around with the client

Still doesn't work
Removed cryptico libary zip-archive
Minor change in core.js