Implemented inline image support for <Text>

Summary: @​public

This diff implements inline image support for <Text> nodes. Images are specified using <Image> tags, however all properties of the image are currently ignored apart from the source (including width/height styles).

Images are loaded asyncronously, and will trigger a text re-layout when they have loaded.

Reviewed By: @javache

Differential Revision: D2507725

fb-gh-sync-id: 59d0696d00a1bc531915cc35242a16b2dec96e85

Examples/UIExplorer/TextExample.ios.js

@@ -17,6 +17,7 @@
 
 var React = require('react-native');
 var {
+  Image,
   StyleSheet,
   Text,
   View,
@@ -397,6 +398,17 @@ exports.examples = [
       </View>
     );
   },
+}, {
+  title: 'Inline images',
+  render: function() {
+    return (
+      <View>
+        <Text>
+          This text contains an inline image <Image source={require('./flux.png')}/>. Neat, huh?
+        </Text>
+      </View>
+    );
+  },
 }];
 
 var styles = StyleSheet.create({