Added optional argument to pass when binding

[dhenson02]

This prevents the closure loop issue when the value has changed from what it originally was and all uncalled tasks will have the same value.

Added tests this time :+1:

[coveralls]

Coverage increased (+0.05%) to 98.45% when pulling 4e4b3e414257ba5b8d9e0d3973955ea112a712ba on dhenson02:master into e1bcd99ff100ef03793009a320b8c02a65a907c0 on wilsonpage:master.

[wilsonpage]

Thanks for your PR 😄

Although, I'm a little confused why you cannot just do:

fastdom.measure(myTask.bind(this, boundArg);

I would favour that approach over adding additional features.

[dhenson02]

understandable. thanks anyway