Tilequeue

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* Backport fix for including VERSION file in package. See [265](https://github.com/tilezen/tilequeue/pull/265).

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* Add additional postgres support to toi (tiles-of-interest) gardening. See [204](https://github.com/tilezen/tilequeue/pull/204).
* Add default toi-prune cfg to fix test failures. See [215](https://github.com/tilezen/tilequeue/pull/215).
* Reduce default queue buffer size. See [214](https://github.com/tilezen/tilequeue/pull/214).
* Remove temporary Redis TOI dump command. See [196](https://github.com/tilezen/tilequeue/pull/196).

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* Backport fix for including VERSION file in package. See [265](https://github.com/tilezen/tilequeue/pull/265).

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* Move TOI from redis to s3.
* Support reading immortal tiles from s3.
* Split up process_coord into process and format.
* Create a TOI set on seed if file toi-set doesn’t exist.
* Add fix when metatiles are disabled.
* Support single file for intersect command.
* Add only valid zoom levels to TOI.

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* **New features:**
* Add new command that 'gardens' the tiles of interest set to add and remove tiles based on various rules. See [176](https://github.com/tilezen/tilequeue/pull/176), [178](https://github.com/tilezen/tilequeue/pull/178), [179](https://github.com/tilezen/tilequeue/pull/179), [180](https://github.com/tilezen/tilequeue/pull/180), [182](https://github.com/tilezen/tilequeue/pull/182), [183](https://github.com/tilezen/tilequeue/pull/183), [184](https://github.com/tilezen/tilequeue/pull/184), and [189](https://github.com/tilezen/tilequeue/pull/189).
* **Enhancements:**
* When enqueueing tiles of interest for seed rendering, enqueue at zoom level 15 instead of 16. See [181](https://github.com/tilezen/tilequeue/pull/181).
* Add optional support for `statsd` in command.py. See [185](https://github.com/tilezen/tilequeue/pull/185).

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* **New features:**
* Add support for 2x2 metatiles (and 512px tiles). See [163](https://github.com/tilezen/tilequeue/pull/163), [166](https://github.com/tilezen/tilequeue/pull/166), and [169](https://github.com/tilezen/tilequeue/pull/169).
* Cut child 256px tiles from 512px parent in the 2x2 metatile, rather than re-requesting that 256px bbox from database. See [158](https://github.com/tilezen/tilequeue/pull/158).
* Pass nominal zoom instead of coordinates. See [161](https://github.com/tilezen/tilequeue/pull/161).
* **Enhancements:**
* Drop parts of MultiPolygons which lie outside the clip boundary of the tile (primarily affects buildings and water layers). See [171](https://github.com/tilezen/tilequeue/pull/171).
* Make queue sizes configurable, and default to smaller queue size to accomodate larger 2x2 metatiles. See [172](https://github.com/tilezen/tilequeue/pull/172).
* Move existing tiles of interest (TOI) instead of copying it to avoid AWS Redis failover. See [122](https://github.com/tilezen/tilequeue/pull/122).
* Load new TOI from file 'toi.txt', just as the TOI dump process saves to 'toi.txt'. See [122](https://github.com/tilezen/tilequeue/pull/122).
* **Bug fixes:**
* Delete rejected jobs from SQS queue. See [173](https://github.com/tilezen/tilequeue/pull/173).
* Trap MemoryError and let ops recover process. See [174](https://github.com/tilezen/tilequeue/pull/174).
* Fix LinearRing error. See [175](https://github.com/tilezen/tilequeue/pull/175).