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/svg/svg-loader.shadow.scss

@@ -0,0 +1,10 @@
+:host{
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+
+    .spinner{
+        padding: .5rem;
+    }
+}