whisper-merge-helper.sh -- programmatic help with merging StatsD whisper stores

where:
  -?  show this help text
  -s  source_directory (example: /mnt/storage/api)
  -t  target_directory (example: /mnt/storage/api/v1)
  -n  StatsD namespace to cleanup
  -p  StatsD TCP interface (default: 8126)
  -h  StatsD TCP hostname (default: localhost)
  -c  Command to run (default: whisper-merge.py)
  -f  Force run. Do not exit on error
  -d  Dry run, and output debug information"

./whisper-merge-helper.sh -s example/source -t example/target -n .foo
     echo $? #=> 0

./whisper-merge-helper.sh -s example/source -t example/target -n .foo -d

    Dry run: whisper-merge.py example/source/count.wsp example/target/count.wsp
    Dry run: whisper-merge.py example/source/rate.wsp example/target/rate.wsp
    Dry run: echo 'delcounters .foo' | nc localhost 8126
    Dry run: rm -r example/source

./whisper-merge-helper.sh -s example/source -t example/target -n .foo -d -c /opt/whisper.py

    Dry run: /opt/whisper.py example/source/count.wsp example/target/count.wsp
    Dry run: /opt/whisper.py example/source/rate.wsp example/target/rate.wsp
    Dry run: echo 'delcounters .foo' | nc localhost 8126
    Dry run: rm -r example/source