Unsubscribing should clear all data associated with that subscription.

[tannerpreiss]

If I do a listen:

CSKey deviceKey = CSKey.fromString("a.b.c");
Subscription subscription = csApp.listen(deviceKey)
    .subscribe(response -> Log.d("tag", response));

Then later I unsubscribe to that subscription:

deviceKey.unsubscribe();

Then the data at "a.b.c" changes a few times

Then I resubscribe to "a.b.c":

CSKey deviceKey = CSKey.fromString("a.b.c");
Subscription subscription = csApp.listen(deviceKey)
    .subscribe(response -> Log.d("tag", response));

In the subscribe callback for my new subscription I will receive the value at "a.b.c" at the time of my initial unsubscription, and then will also receive the current value at "a.b.c". I only want to receive the current value upon resubscription of a path.