Reorganise and expand filtering of unwanted hits

The bouncer paths which are removed were already covered by FURNITURE_PATTERNS.

The paths and patterns which have been added were derived from looking at the
hits files and using Google to evaluate trade-offs where appropriate.


BEFORE:
```
bundle exec rake import:all:hits  102.27s user 51.56s system 32% cpu 8:00.60 total

irb(main):001:0> Hit.count
=> 2,247,005
irb(main):002:0> HostPath.count
=> 111,524
irb(main):003:0> DailyHitTotal.count
=> 114,345
```

AFTER:
```
bundle exec rake import:all:hits  97.92s user 54.70s system 24% cpu 10:24.89 total

irb(main):001:0> Hit.count
=> 2,214,709
irb(main):002:0> HostPath.count
=> 108,602
irb(main):003:0> DailyHitTotal.count
=> 113,934
```