fix several lint warnings

Summary: fix some ling warnings from several files
Closes https://github.com/facebook/react-native/pull/4450

Reviewed By: svcscm

Differential Revision: D2707606

Pulled By: mkonicek

fb-gh-sync-id: 410ccacf061ac7b0f6e44d1a5e4621a9d1d606fc

Libraries/Components/MapView/MapView.js

@@ -232,7 +232,7 @@ var MapView = React.createClass({
        * @platform ios
        */
       image: Image.propTypes.source,
-      
+
       /**
        * annotation id
        */

Libraries/Components/View/ViewStylePropTypes.js

@@ -48,7 +48,7 @@ var ViewStylePropTypes = {
   shadowOpacity: ReactPropTypes.number,
   shadowRadius: ReactPropTypes.number,
   /**
-   * (Android-only) Sets the elevation of a view, using Android's underlying 
+   * (Android-only) Sets the elevation of a view, using Android's underlying
    * [elevation API](https://developer.android.com/training/material/shadows-clipping.html#Elevation).
    * This adds a drop shadow to the item and affects z-order for overlapping views.
    * Only supported on Android 5.0+, has no effect on earlier versions.