Detects if is Android or IOS. This code is very useful and i don't want to go Stackoverflow every time i need it LOL. Code from: http://stackoverflow.com/a/21742107

detect android or ios

function getMobileOperatingSystem() {
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

    if (/android/i.test(userAgent)) {
        return "Android";
    }

    // iOS detection from: http://stackoverflow.com/a/9039885/177710
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "iOS";
    }

    return "unknown";
}