fix typo 'stats_count.' -> 'stats_counts' and reword for clarity
Merge pull request #240 from jehiah/legacy_prefix_typo_240

Readme typo - legacy key prefix is incorrect
    Merge PR 233 -
      - add a bit more debug output - sets, numStats
      - update debug log to new logger, make all debug prints
        use consistent DEBUG: prefix by removing the extra arg
    Merge PR #232 -
     Add config and logic to allow all stat types to be deleted
     instead of sending zero or previous value
    Merge PR #231 -
     - fix the deleteCounters bug where packets_received and
       bad_lines_seen are deleted - cannot ++ an undefined value..
     - adjust how we check for the stats counters to support the
       prefixStats patch - should apply safe with and without the patch
     - correct delete_counters unit test to not look for
       bad_lines_seen of NaN instead look for it set to 1
    Merge PR #215 -
     updated new namespacing to support prefixes instead of
     suffixes - allows easier grouping by incoming key
     configurable as an alternative to prefixes (except for
     statsd stats themselves)