Upload events / map of current uploads

[drd33m]

Hi, I am loving this library and I think this addition will make it even better.

As of the current state of the library. There is no way to get a list of the current uploads that are running and or the state of them other then the logging that is happening inside the library itself.

I would like to see maybe events being added in the place of logging for uploads such as when a upload is started. This would also allow you to keep track of how many upload slots are being used, and maybe a uploadUpdate event that can be used to track current speed of the transfer