MapView to support MKPointAnnotation using new attribute annotate in Map...

Summary:
### MapView to support Pin annotation

    var pinLocation = {
			latitude: property.latitude,
			longitude: property.longitude,
			title: property.title
    };
    this.state = {propertyPoint: pinLocation};
    <MapView style={styles.map} region={this.state.region} annotate={this.state.propertyPoint}>
    </MapView>
![mapview-pinannotation](https://cloud.githubusercontent.com/assets/845379/7100280/6c1ffc08-dfe5-11e4-9d1b-8da6a65da1bc.png)

Closes https://github.com/facebook/react-native/pull/810
Github Author: guru inamdar <guru.inamdar@gmail.com>

Test Plan: Imported from GitHub, without a `Test Plan:` line.

Examples/UIExplorer/TextInputExample.js

@@ -109,7 +109,7 @@ var styles = StyleSheet.create({
     flex: 1,
   },
   label: {
-    width: 80,
+    width: 120,
     justifyContent: 'flex-end',
     flexDirection: 'row',
     marginRight: 10,
@@ -311,4 +311,29 @@ exports.examples = [
       );
     }
   },
+  {
+    title: 'Clear and select',
+    render: function () {
+      return (
+        <View>
+          <WithLabel label="clearTextOnFocus">
+            <TextInput
+              placeholder="text is cleared on focus"
+              value="text is cleared on focus"
+              style={styles.default}
+              clearTextOnFocus={true}
+            />
+          </WithLabel>
+          <WithLabel label="selectTextOnFocus">
+            <TextInput
+              placeholder="text is selected on focus"
+              value="text is selected on focus"
+              style={styles.default}
+              selectTextOnFocus={true}
+            />
+          </WithLabel>
+        </View>
+      );
+    }
+  },
 ];