Fixes Refractory Timer

[micahwoodard]

Looking closer at the refectory period again, I saw a bug where even though the time sampled is different each draw, the timer is terminating on the first drawn interval. So for a session like this, even though all of the times are different, the timer only waits for 1.7 each time

Fixed by adding timer into defer group

[bruno-f-cruz]

For future reference (I did not appreciate this detail myself). Repeat overloads the Repeat Rx operator. This means it simply resubscribes to the original observable. Timer sets its due time on Generate. So, when Repeat is trigger, the Generate doesn't run and you inherit whatever property was already there at the observable creation (the first time it was created). To get around this, we use Defer/SelectMany that actually CREATES a new observable and sets a new due time each time.