Fixed a bug relating to custom-elements's first vnode where render(){ return <div class="example" /> } would set the example-class on the custom-element itself.

Added support for className and style similar to react
Cleaned up some comments
Reworked how tests are built in order to add a new test "pdf" which was a small side-project where previous mentioned bug showed up, it's an example using HTML to create a PDF for printing

tests/todos-mvc/index.jsx

@@ -0,0 +1,10 @@
+import {render} from "../../packages/csx";
+import style from "./index.scss";
+import {MyTodo} from "./components/my-todo";
+
+// Replace this with an example implementation of the Todos-MVC app
+// look for inspiration here: https://github.com/shprink/web-components-todo
+document.body.appendChild(render(<style>{style}</style>));
+document.body.appendChild(render(<div class="center-me">
+    <MyTodo />
+</div>));