Add findDOMNode transform

npm-react-codemod/test/findDOMNode-test.js

@@ -0,0 +1,34 @@
+'use strict';
+
+var React = require('React');
+
+var Composer = React.createClass({
+  componentWillReceiveProps: function(nextProps) {
+    this.getDOMNode();
+    return foo(this.refs.input.getDOMNode());
+  },
+
+  foo: function() {
+    var ref = 'foo';
+    var element = this.refs[ref];
+    var domNode = element.getDOMNode();
+  },
+
+  bar: function() {
+    var thing = this.refs.foo;
+    thing.getDOMNode();
+  },
+
+  foobar: function() {
+    passThisOn(this.refs.main.refs.list.getDOMNode());
+  }
+});
+
+var SomeDialog = React.createClass({
+  render: function() {
+    call(this.refs.SomeThing);
+    return (
+      <div />
+    );
+  }
+});