Using Confugure() with a property set to 0 does not update the property

[icbat]

I'm assuming because you're looking for a property's existence by evaluating if it's false-y.

My use case is that I want to use this plugin to move between multiple states with the some of the same objects rendered without a flashing effect. My current workaround is to set the duration to 0.000001, but that's uglier than I'd like =)

I don't know enough JS to safely fix this, or I'd submit a PR.