More fixes for https://webarchive.jira.com/browse/ARI-3985
Revert "More fixes for https://webarchive.jira.com/browse/ARI-3985"

This reverts commit 6129095fc0692cab6c7afb06552fc3b73e30b533.
Don't rewrite path-relative urls. Still rewrite host-relative urls.
Updated unit tests and contextualization to take into account no-rewrite of path-relative
Remove unneeded imports.
Remove unneeded changes.
Merge pull request #42 from vonrosen/ari-3985

More fixes for https://webarchive.jira.com/browse/ARI-3985