I found the solution! Actually, the problem was solved from the beginning.
When you add Cordova Geolocation Plugin, it doesn't create a new folder anymore. It just add the needed source files and edit the config.xml.
I don't know for sure if this only happens on newer version of Cordova (3.0 +), but here the pluging is working normally.
So, for install the plugin and get it working, you need to:
Add the plugin
cordova plugin add org.apache.cordova.geolocation
and then you can already call the core functions without doing nothing.
navigator.geolocation.getCurrentPosition(geolocationSuccess);
function geolocationSuccess (position) {
alert(position.coords.latitude); }
Than you, Gas Welder!