sfeast

### Description Setting the lowerThreshold property to a falsy value does not fully disable lower threshold trigger events when reaching the bottom of the scrolling region. ### Expected outcome When...

For example something like: ``` ``` with getLocation defined as: ``` getLocation: function() { return "https://dinosaur-facts.firebaseio.com/dinosaurs"; } ``` gives the following:  Looks like an issue in _applyLocalDataChanges since it...