Updated util.js tests
Updated forms.js test HTML to match React output

- Added render wrapping to the reactHTMLElement assertion when given an Array
- reactHTMLElement just uses strictEqual if given a String as its component argument
- Renamed defaultRendering() methods to render()
- Removed some remaining toString() methods
- 'class' => 'className
- Made special case handling for forms with all hidden fields using an error row not spit out an empty <span>