set proxy

set proxy to the module
simple example:
var NA = require("nodealytics");

NA.initialize('UA-xxxxxxxx-1', 'google-analytics-page', function () {

	NA.setProxy("t"http://this-is-my-proxy-server");
        NA.trackEvent('debug', 'debug', 'debug', function (err, resp) {
                if (!err && resp && resp.statusCode === 200) {
                        console.log('it worked!');
                } 
        });
});