v1.7.0

• New features:
  • Add new command that 'gardens' the tiles of interest set to add and remove tiles based on various rules. See #176, #178, #179, #180, #182, #183, #184, and #189.
• Enhancements:
  • When enqueueing tiles of interest for seed rendering, enqueue at zoom level 15 instead of 16. See #181.
  • Add optional support for statsd in command.py. See #185.