Test using domino instead of jsdom

[jaredlockhart]

No description provided.

[erikrose]

Looks sane to me. r+

[erikrose]

Actually, domino talks about not being suitable for untrusted input. So, hmmm.

[erikrose]

I see it doesn't download external resource or execute scripts, so I'm not sure what they're talking about.

[pdehaan]

A couple other refs to jsdom which may now need revisiting:

1. /karma.conf.js:32:

     externals: {
       'jsdom': 'jsdom',
     },

2. /README.md:19:

   Each function expects to be passed a Document object, which may be created either directly by a browser or on the server using a Document compatible object, such as that provided by jsdom.