Ender extension for firing multiple ajax requests at once

Makes loading of multiple assets easier

Usage:

$.loadAssets({
    assets: {
        'asset1': 'foo.html',
        'asset2': { url: 'bar.json', type: 'jsonp' }
    },
    success: function(data) {
        // do something with data.asset1 and data.asset2
    }
});