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/postcss.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+    plugins: [
+        //require('autoprefixer'),
+        require('postcss-import'),
+        require('postcss-preset-env')({
+            stage: 1,
+        })
+    ]
+};