Attempt to fix issues #28 and #30

Changed document.location to window.location and added
console.info call to setUp() function. Added 'urlrewrite' filter
and InvalidUrlhandler servlet config to web.xml but commented
out after I found that Wayback handles invalid URLs such as

`http://host/invalid/url`

by redirecting to

`http://host/wayback/<current timestamp>/invalid/url`

*when* it is installed in the ROOT context.