Remove jsdom dependency about html2jade

[donpark]

Interesting suggestion. I used jsdom instead of using htmlparser directly because I wanted to cover javascript generated document as well. Perhaps a good compromise is to use static HTML conversion as default and make dynamic document conversion an option.

[donpark]

I just realized that removing jsdom dependency from html2jade will require adding a htmlparser-specific layer to simulate DOM API which is required to continue supporting convertDocument method.

Given that amount of change is not trivial, I'm going to defer this issue until later. Of course, you are welcome to fork and hack as always if you can't wait. :-)

[donpark]

version 0.7 replaces jsdom with jsdom-little which apparently don't have problematic contextify dependency. while not exactly matching this issue, it's a move in the right direction.

@Lightblade Please close this issue if you feel your needs are met. Leave it as is otherwise. Thx.

[ming-codes]

Sure. Thanks for getting that out.