Merge pull request facebook#44 from vjeux/script_download

Add <script> tags in the download page for easy embed

Author: zpao

docs/downloads.md

@@ -17,12 +17,24 @@ Download the starter kit to get everything you need to
 #### <a href="http://fb.me/react-{{site.react_version}}.min.js">React Core {{site.react_version}} (production)</a>
 The compressed, production version of React core
 
+```html
+<script src="http://fb.me/react-{{site.react_version}}.min.js"></script>
+```
+
 #### <a href="http://fb.me/react-{{site.react_version}}.js">React Core {{site.react_version}} (development)</a>
 The uncompressed, development version of React core with inline documentation.
 
+```html
+<script src="http://fb.me/react-{{site.react_version}}.js"></script>
+```
+
 #### <a href="http://fb.me/JSXTransformer-{{site.react_version}}.js">JSX Transform</a>
 The JSX transformer used to support [XML syntax](/react/docs/syntax.html) in JavaScript.
 
+```html
+<script src="http://fb.me/JSXTransformer-{{site.react_version}}.js"></script>
+```
+
 ## Bower
 
 ```sh