This should fix #500 well enough.
It breaks the Sizzle test with an uncaught exception that `this.CSSStyleDeclaration` is `undefined`. But only when running the tests together, not when running the sizzle tests alone! A very bad sign.
This reveals a number of bugs in jsdom and nwmatcher. The latter are filed. I tried to minimize the modifications to the Sizzle test suite using some new techniques in the runner. The only remaining ones are needing to change the `broken` function declaration to a variable expression, and commenting out all the focus-related stuff since we don't have `focus` and `blur` on all elements (yet).
…n purposes. Closes #532
Fixed bug where script passed to jsdom.env contains spaces
Allows skipping downloading/fetching resources with URLs matching a given regular expression.