* feat(task): add limit function for task concurrency
The new task executor handles limit's differently then the old executor
instead of front loading limits by creating a runner for every task that might run
the new executor has a large worker pool and queue. This allow's us to have a unlimited
concurrency per task and helps us avoid a back log of task's execution based on a
arbitrary execution limit. This add's the ability to add an optional task execution limit
so a user can still have the advantages of limiting concurrency.
* feat(task): Remove token's from task structures
We had previously removed token's from the task api but left the token in place in several locations in the stack.
Now we can cleanly remove the extra tokens.
Alirie Gray
Lyon Hill