Blows up when attribute has newlines

When using a templating engine then sometimes element attributes will have newlines in them like this:

```
<div class="foo {{#ifSomething}} bar{{/ifSomething}}
  {{#ifSomethingElse}} baz{{/ifSomethingElse}}></div>
```

When using Mustache for example, then line-feed is preserved in the output with `\n` and giving html like this to dom2hscript will blow it up.
