log_merger 0.2.0

Added

• --line_numbers command line option to show line numbers in the merged output
• --encoding command line argument to override system default encoding when reading files
• --start and --end command line arguments to specify start and end timestamps to select a
  specific time window from the merged logs; values may be an absolute timestamp in various
  formats, or relative times such as "5m" for "5 minutes ago"
• support for direct merging of gzip-encoded files (such as z.log.gz)
• support for log timestamps with delimiting "T" between date and time
• support for log timestamps that are seconds (int or float) or milliseconds since epoch