async: using callback along with requirejs config's urlArgs

[denis-itskovich]

There is a problem when using urlArgs along with callback parameter. The following use case seems to be not supported:

requirejs.config({
    urlArgs: 'bust=v2',
    // ...
});

define(['async!https://apis.google.com/js/client.js!onload'], function() {
    // ...
});

Following happens in this case: async plugin receives as a name https://apis.google.com/js/client.js!onload?bust=v2, thus the entire string onload?bust=v2 is taken as a parameter name, which is incorrect