Setting user alias

To set user alias on Pushbots:

iOS:

Objective-c 

[Pushbots setAlias:@"username"];

swift: 

Pushbots.setAlias("username")

Android:

Pushbots.sharedInstance().setAlias("username");

Phonegap:

window.plugins.PushbotsPlugin.setAlias("username");

React native:

Pushbots.setAlias("username")

Web:

PB.q.push(["alias", "username"]);