IE Document type not found

[efortuna]

The result of raw.get$typeName() in IE, where raw is the wrapped document object, is "Document" instead of "HTMLDocument."

This causes us to hit the "UnsupportedOperationException" in "LevelDom.wrapDocument":
switch (raw.get$typeName()) {
    case "HTMLDocument":

      return new DocumentWrappingImplementation._wrap$ctor(raw, raw.get$documentElement());

    case "SVGDocument":

      return new SVGDocumentWrappingImplementation._wrap$ctor(raw);

    default:

      $throw(new UnsupportedOperationException("Unknown type:" + raw.toString$0()));

[dgrove]

Added this to the FrogEditor milestone.

[efortuna]

Set owner to @efortuna.
Added Accepted label.

[efortuna]

Added Fixed label.