title: unknown option: --watch when trying to use jsx --watch
body: <p>I am following the react docs, getting started. <a href="https://facebook.github.io/react/docs/getting-started.html" rel="nofollow">https://facebook.github.io/react/docs/getting-started.html</a>. And according to it I installed react-tools via npm. And tried to do this <code>jsx --watch src/build/</code> I had helloworld.js(which contains jsx) in src, and I expected to generated the helloworld.js(plain js) in the build/helloworld.js. But I am getting unknown option: watch error. Where as jsx is getting recognized. So where am I going wrong with this?</p>