Merge pull request ptomasroos#559 from zumaawad/master

RTL ScrollableTabBar support

Author: skv-headless

ScrollableTabBar.js

@@ -8,6 +8,7 @@ const {
   Text,
   Platform,
   Dimensions,
+  I18nManager
 } = ReactNative;
 const Button = require('./Button');
 
@@ -157,10 +158,11 @@ const ScrollableTabBar = React.createClass({
       bottom: 0,
     };
 
+    const key = I18nManager.isRTL ? 'right' : 'left';
     const dynamicTabUnderline = {
-      left: this.state._leftTabUnderline,
-      width: this.state._widthTabUnderline,
-    };
+      [`${key}`]: this.state._leftTabUnderline,
+      width: this.state._widthTabUnderline
+    }
 
     return <View
       style={[styles.container, {backgroundColor: this.props.backgroundColor, }, this.props.style, ]}