Fixed incorrectly rendered endTag

Forward slashes in end tags where places incorrectly, rendering invalid HTML.

It was: <div>foo<div/>
It is now: <div>foo</div>

Notice the placement of the forward slash in the closing tag
Fixed incorrect match on HTML5Attr

The toString method didn't work because an incorrect match on the HTML5Attr type. Result was that html attributes where not rendered. This is fixed.
Merge pull request #500 from jeroenpeeters/master

Fixed two issues in HTML5 module.