Commits on Jul 25, 2015

1. Complete steps for ChildNode::before …

   I was reading through the node.rs file and noticed that this `before`
   method only has three steps, despite the WHATWG website saying there are
   six. I implemented the steps as per:
   
   https://dom.spec.whatwg.org/#dom-childnode-before
   
   I also added another WPT unit test

   

   frewsxcv committed Jul 25, 2015

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