[Tile-serving] [openstreetmap/osm2pgsql] Rewrite tile expiry (management of expired tiles) (#709)

[Matt Amos]

Mapzen has a [process](https://github.com/tilezen/tilequeue/blob/master/tilequeue/command.py#L335) which takes the list of expired tiles which `osm2pgsql` produces at zoom 16, creates the pyramid of their ancestors, and intersects that with the "tiles of interest" - a set of every tile we've got rendered. The result is put into a queue for re-rendering.

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