Fix navigation bar and extension view hiding suddenly #22
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Right after a small pan gesture that wasn't enough to hide the navigation bar and the extension view, if pan gesture is fired again the navigation and the extension hide suddenly.
I noticed this bug happening more frequently with an extension view but I think it's possible to simulate it in other scenarios.
Here an example:
![nav_bug](https://cloud.githubusercontent.com/assets/1298990/12404107/f3b96bae-be1f-11e5-921f-6d69bc81cc30.gif)
Fixed it by resetting the
previousYOffset
athandleScrollingEnded
toNaN
.Here's the expected result:
![nav_fix](https://cloud.githubusercontent.com/assets/1298990/12404152/32377254-be20-11e5-8487-8a421bfd52b0.gif)