[Tile-serving] [mod_tile] UTFGrid support for mod_tile (#58)

[apmon]

Adding UTFGrid is somewhere on my todo list and I have had a brief look at it in the past.

If full UTFGrid support would be added to mapnik's C++ api, that would be great and should make support for it much easier in renderd. However, given that mapnik can already create the grid objects, albeit as boost binary object, it shouldn't be that difficult to add it to renderd anyway, as it is mostly about serialising the data out to a json string.

If I remember correctly, you still need to style the UTFGrid stuff to declare what to include, so one question would be how best to pass this information on to renderd?

@mikelmaron are you planning on working on this? I might be able to help if you are.

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