v1.1.0

Changelog

• 5dc941a add barebones upload command and stub show command
• 18aa427 add code path for migrating v2 to v3 in convert
• 6957ee2 implementation of v2 to v3 upgrader
• f0a8df1 remove v2 writer; stub out subpyramid functionality
• a903fba set uploader concurrency/buffer size
• 52d1129 upload command takes options flags
• d00b536 v2 to v3 migration: handle leaf directories
• 1612134 v2 to v3: fix tile type detection and minzoom/maxzoom as strings in v2 metadata