Merge pull request ptomasroos#290 from chunghe/master

fix Platform logic

Author: skv-headless

ScrollableTabBar.js

@@ -84,7 +84,7 @@ const ScrollableTabBar = React.createClass({
     newScrollX -= this.props.scrollOffset;
     newScrollX = newScrollX >= 0 ? newScrollX : 0;
 
-    if (Platform === 'android') {
+    if (Platform.OS === 'android') {
       this._scrollView.scrollTo({x: newScrollX, y: 0, });
     } else {
       const rightBoundScroll = this._tabContainerMeasurements.width - (this._containerMeasurements.width);