clone docs

Author: petehunt

docs/_data/nav_docs.yml

@@ -47,6 +47,8 @@
       title: Class Name Manipulation
     - id: test-utils
       title: Test Utilities
+    - id: clone-with-props
+      title: Cloning Components
   - id: examples
     title: Examples
 - title: Reference

docs/docs/09.4-test-utils.md

@@ -4,7 +4,7 @@ title: Test Utilities
 layout: docs
 permalink: test-utils.html
 prev: class-name-manipulation.html
-next: examples.html
+next: clone-with-props.html
 ---
 
 `React.addons.TestUtils` makes it easy to test React components in the testing framework of your choice (we use [Jasmine](http://pivotal.github.io/jasmine/) with [jsdom](https://github.com/tmpvar/jsdom)).

docs/docs/09.5-clone-with-props.md

@@ -0,0 +1,14 @@
+---
+id: clone-with-props
+title: Cloning Components
+layout: docs
+permalink: clone-with-props.html
+prev: test-utils.html
+next: examples.html
+---
+
+In rare situations a component may want to change the props of a component that it doesn't own (like changing the `className` of a component passed as `this.props.children`). Other times it may want to make multiple copies of a component passed to it. `cloneWithProps()` makes this possible.
+
+#### `ReactComponent React.addons.cloneWithProps(ReactComponent component, object? extraProps)`
+
+Do a shallow copy of `component` and merge any props provided by `extraProps`. Props are merged in the same manner as [`transferPropsTo()`](/react/docs/component-api.html#transferpropsto), so props like `className` will be merged intelligently.