Clear debounceCheck when deactivating

[danistefanovic]

The VisibilitySensor doesn't get reactivated if scrollCheck is active. That's because this.debounceCheck is not cleared properly and still contains the debounced function after stopWatching() has run.

Under these circumstances, the following condition is true and startWatching() gets skipped:

  startWatching: function () {
    if (this.debounceCheck || this.interval) { return; }

[joshwnj]

Thanks @danistefanovic , good catch :)

[joshwnj]

Published to npm as v3.6.2