Add iOS tintColor prop to TextInput

Summary:
In response to https://github.com/facebook/react-native/issues/5595

Adds tintColor property to TextInput component for iOS:

<img width="375" alt="screen shot 2016-01-28 at 1 39 35 pm" src="https://cloud.githubusercontent.com/assets/3868826/12730689/eae58a36-c8e1-11e5-9453-70716617bfab.png">

Usage:

<img width="454" alt="screen shot 2016-01-28 at 1 42 37 pm" src="https://cloud.githubusercontent.com/assets/3868826/12730711/fedeed8e-c8e1-11e5-87d0-1621d19a0418.png">
Closes https://github.com/facebook/react-native/pull/5678

Reviewed By: svcscm

Differential Revision: D2895115

Pulled By: nicklockwood

fb-gh-sync-id: bfb52b992d5e02754fe47f409f6e8df426514718

Examples/UIExplorer/TextInputExample.ios.js

@@ -536,6 +536,25 @@ exports.examples = [
       );
     }
   },
+  {
+    title: 'Colored highlight/cursor for text input',
+    render: function() {
+      return (
+        <View>
+          <TextInput
+            style={styles.default}
+            tintColor={"green"}
+            defaultValue="Highlight me"
+          />
+          <TextInput
+            style={styles.default}
+            tintColor={"rgba(86, 76, 205, 1)"}
+            defaultValue="Highlight me"
+          />
+        </View>
+      );
+    }
+  },
   {
     title: 'Clear button mode',
     render: function () {

Libraries/Components/TextInput/TextInput.js

@@ -226,6 +226,11 @@ var TextInput = React.createClass({
      * The text color of the placeholder string
      */
     placeholderTextColor: PropTypes.string,
+    /**
+    * The highlight and cursor color of the text input
+    * @platform ios
+    */
+    tintColor: PropTypes.string,
     /**
      * If true, the text input obscures the text entered so that sensitive text
      * like passwords stay secure. The default value is false.

Libraries/Text/RCTTextFieldManager.m

@@ -78,6 +78,7 @@ RCT_EXPORT_VIEW_PROPERTY(autoCorrect, BOOL)
 RCT_REMAP_VIEW_PROPERTY(editable, enabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(placeholder, NSString)
 RCT_EXPORT_VIEW_PROPERTY(placeholderTextColor, UIColor)
+RCT_EXPORT_VIEW_PROPERTY(tintColor, UIColor)
 RCT_EXPORT_VIEW_PROPERTY(text, NSString)
 RCT_EXPORT_VIEW_PROPERTY(maxLength, NSNumber)
 RCT_EXPORT_VIEW_PROPERTY(clearButtonMode, UITextFieldViewMode)

Libraries/Text/RCTTextViewManager.m

@@ -28,6 +28,7 @@ RCT_EXPORT_VIEW_PROPERTY(autoCorrect, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(blurOnSubmit, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(clearTextOnFocus, BOOL)
 RCT_REMAP_VIEW_PROPERTY(color, textView.textColor, UIColor)
+RCT_EXPORT_VIEW_PROPERTY(tintColor, UIColor)
 RCT_REMAP_VIEW_PROPERTY(editable, textView.editable, BOOL)
 RCT_REMAP_VIEW_PROPERTY(enablesReturnKeyAutomatically, textView.enablesReturnKeyAutomatically, BOOL)
 RCT_REMAP_VIEW_PROPERTY(keyboardType, textView.keyboardType, UIKeyboardType)