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

packages/babel-plugin-transform-csx/package.json

@@ -28,6 +28,7 @@
     "rollup-plugin-commonjs": "latest",
     "rollup-plugin-terser": "latest",
     "rollup-plugin-json": "latest",
+    "rollup-plugin-postcss": "latest",
     "npm-run-all": "latest"
   },
   "dependencies":{