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

[Paul Norman]

> Polygons will no longer be expired by their bounding box. The algorithm tries some approximation (but still uses bounding boxes in some kind).

This this mean that the current algorithm expires something like the blue box and the new one would do something the green box, assuming the black/pink shape is a new polygon?

![image](https://user-images.githubusercontent.com/1190866/36197571-fcf5f396-1128-11e8-960a-ca1f83cf0384.png)


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