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Feature request

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The fileLoader type should have methods indicating whether load/upload is complete.

Use case is that you want to reuse loader request in multiple instances (e.g. for multiple widgets). Currently the only way to know that the request has ended is to listen to a proper events, but once the request is done events are no longer fired. Thus if you bound listener to uploaded event after uploaded is done you will never get notified.

Having the isUploaded() method instead you would check whether it is already uplaoded during widget creation. If true you access the response synchronously, if not you bind to uploaded event as you'd normally do.