color support for TextInput secureTextEntry={true}

Summary:Color property is ignored for TextInput with secureTextEntry={true} on Android.

This is coming  from #6540 and being split into 2 PRs by suggestion of dmmiller.
As he mentioned does almost the same  except it #6064 doesn't handle null case.

Working example:

![scn949wlce](https://cloud.githubusercontent.com/assets/1247834/13929873/b700d650-ef72-11e5-9d67-0a7e0385bc2a.gif)
Closes https://github.com/facebook/react-native/pull/6563

Differential Revision: D3077583

Pulled By: mkonicek

fb-gh-sync-id: f0761346b77060abf17f1d4573b375adebc5c607
shipit-source-id: f0761346b77060abf17f1d4573b375adebc5c607

Examples/UIExplorer/TextInputExample.android.js

@@ -410,11 +410,19 @@ exports.examples = [
     title: 'Passwords',
     render: function() {
       return (
-        <TextInput
-          defaultValue="iloveturtles"
-          password={true}
-          style={styles.singleLine}
-        />
+        <View>
+          <TextInput
+            defaultValue="iloveturtles"
+            secureTextEntry={true}
+            style={styles.singleLine}
+          />
+          <TextInput 
+            secureTextEntry={true}
+            style={[styles.singleLine, {color: 'red'}]}
+            placeholder="color is supported too"
+            placeholderTextColor="red"
+          />
+        </View>
       );
     }
   },