Revert "Merge pull request #26 from zendesk/adam_and_alistair/fix-play-button-race-condition"

This reverts commit 09cfa31d0de37be9f8b600a4361398863b24f020, reversing
changes made to db893eea5bb2e9684ed230e3bc197778db13b564.
Fix double-counting users bug
Reduce throttle on appActivated
Add comment explaining use of throttle
Merge pull request #27 from zendesk/alistair/actually_fix_double_count_bug

[APPS-1392] Actually fix double count bug