Adding some base tests and a style transform for html style attributes

I added some tests to make it a little easier to validate any modifications I was making.  I also added a style transform to make it easy to set style attributes on a node.  It follows the same structure as you class transform with a custom selector turning the style attributes into a map.
```clojure
(style :attr1 :path1 
         :att2  :path2)

```