[w3c/editing] execCommand spec should have IDL for execCommand, queryCommand* and designMode (#159)

The execCommand spec[1] doesn't have interface defintion for exeCommand and queryCommand*, we should have it like whatwg spec[2]

```
partial interface Document {
 [CEReactions] attribute DOMString designMode;
 [CEReactions] boolean execCommand(
    DOMString commandId, 
    optional boolean showUI = false, 
    optional DOMString value = "");
  boolean queryCommandEnabled(DOMString commandId);
  boolean queryCommandIndeterm(DOMString commandId);
  boolean queryCommandState(DOMString commandId);
  boolean queryCommandSupported(DOMString commandId);
  DOMString queryCommandValue(DOMString commandId);
}
```
[1] http://w3c.github.io/editing/execCommand.html
[2] https://html.spec.whatwg.org/multipage/dom.html#the-document-object


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