Fix context binding in debounce and throttle functions

[msssk]

@brandonpayton

[csnover]

This conflates lang.hitch/Function.prototype.bind API with other APIs. We used to do this with dojo.connect but do not do it any more.

[csnover]

The only change that needs to be made is the one mentioned in the comment at https://github.com/dojo/dojo/pull/114/files#r18262450, the other changes here aren’t valid

[msssk]

Thanks for clarifying this, @csnover. For reference, in case anyone else doesn't follow what's going on, the function that debounce returns may be called with a particular context, and we want to preserve that within setTimeout. e.g.

declare(null, {
    doSomething: debounce(function () {
        this.doSomethingElse();
    }, 250),
    doSomethingElse: function () {}
})

Any other context binding the user wants to do, as csnover mentioned, should be done with lang.hitch.

[dylans]

Thanks. Closed via 04101da.