React.js should only export the isomorphic stuff. No dependencies on DOM. The secret export stuff is only for the browserify package so we should just do a special case file here:

https://github.com/facebook/react/blob/master/grunt/config/browserify.js#L66

Rename `React.js` -> `ReactBrowserify.js` and `ReactIsomorphic.js` -> `React.js`.

That way we don't take on the dom dependencies in the npm package. Will help with React Native unification.

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule ReactWithAddons
 */
/**