Exclude furniture URLs from hits

These are rarely mapped, are generally not very interesting, but flood the analytics pages.

It will be necessary to truncate the hits and daily_hit_totals tables and then reimport them to remove the already imported furniture hits. This should be easy to do by hand.

Some totally unscientific testing on my VM:
Before:
Hits.count: 2,020,511
bundle exec rake import:all
11.45s user 6.42s system 11% cpu 2:32.23 total

After:
Hits.count: 1,734,744
bundle exec rake import:all
11.08s user 5.90s system 9% cpu 2:57.39 total