Invalid url resolution

[krichprollsch]

With the demo website, if I fetch http://127.0.0.1:1234/campfire-commerce, the <script src="script.js"></script> isn't fetch correctly.

debug(browser): starting GET script.js
debug(browser): starting fetch script.js
info(browser): fetch http://127.0.0.1:1234/script.js: 404
warning(browser): evaljs: error.BadStatusCode

The correct url should be http://127.0.0.1:1234/campfire-commerce/script.js not http://127.0.0.1:1234/script.js.

If I use the same url with a final /, the script is fetched correctly.

[krichprollsch]

fixed by #504