Added support for toggling POI visibility on iOS map view.

Summary: Adds support for toggling points of interests visibility on iOS map view; resolving #3244
Closes https://github.com/facebook/react-native/pull/3631

Reviewed By: svcscm

Differential Revision: D2575148

Pulled By: nicklockwood

fb-gh-sync-id: 0d0ee9d3b4726aa40bc439bc2f36d1db4cae1147

Libraries/Components/MapView/MapView.js

@@ -80,6 +80,13 @@ var MapView = React.createClass({
      */
     showsUserLocation: React.PropTypes.bool,
 
+    /**
+     * If `false` points of interest won't be displayed on the map.
+     * Default value is `true`.
+     * @platform ios
+     */
+    showsPointsOfInterest: React.PropTypes.bool,
+
     /**
      * If `false` the user won't be able to pinch/zoom the map.
      * Default value is `true`.

React/Views/RCTMapManager.m

@@ -37,6 +37,7 @@ RCT_EXPORT_MODULE()
 }
 
 RCT_EXPORT_VIEW_PROPERTY(showsUserLocation, BOOL)
+RCT_EXPORT_VIEW_PROPERTY(showsPointsOfInterest, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(zoomEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(rotateEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(pitchEnabled, BOOL)