Remove domready call

[simonsmith]

On my site I have a MooTools build without the domready module included (a common occurrence, eg scripts at bottom or using AMD) and the reference to it on this line causes the script to fail - https://github.com/ceramedia/CeraBox/blob/master/cerabox.js#L609

Consider removing this and leave the DOM readiness up to the user of the plugin. Alternatively, explicitly list which Core modules the plugin requires.

Apart from this minor issue, a really wonderful plugin. Thanks