Changed animation to use native driver

[RodrigoCS]

Scroll animation now has useNativeDriver, this greatly improves performance.
Also added a prop to scale interpolation outputScaleValue

[skizzo]

This is great @RodrigoCS, thanks! But unfortunately, I can't get it to work:

Environment

react-native: v0.41.2
react: v15.4.2

Code Snippet:

<ParallaxScrollView
      ref={comp => {this.parallaxScrollView = comp}}
      parallaxHeaderHeight={PARALLAX_HEADER_HEIGHT}
      stickyHeaderHeight={STICKY_HEADER_HEIGHT}
      renderBackground={this.renderParallaxBackground}
      renderForeground={this.renderParallaxForeground}
      renderStickyHeader={this.renderParallaxStickyHeader}
      renderFixedHeader={this.renderParallaxFixedHeader}
      >
      <View>...</View>
</ParallaxScrollView>

Result:

Any ideas what I might be doing wrong? Thanks!

[fungilation]

@RodrigoCS thanks for this patch. I confirm my app now have almost always 60 fps scroll animation even when RN js thread is bogged down! 👍🏼