in helper.js [24:31]
getRandomString: function(length) {
var string = '';
var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
for (i = 0; i < length; i++) {
string += letters.charAt(Math.floor(Math.random() * letters.length));
}
return string;
},