[Androd] Fix incorrectly scroll to top after refresh

Author: Yangfan Huang

GiftedListView.js

@@ -288,7 +288,7 @@ var GiftedListView = React.createClass({
 
   _postRefresh(rows = [], options = {}) {
     this._updateRows(rows, options);
-    if (this.props.refreshable === true) {
+    if (this.props.refreshable === true && Platform.OS !== 'android') {
       // @issue
       // if a scrolling is already in progress, this scroll will not be executed
       this._scrollResponder.scrollTo(this.props.refreshableViewHeight);