[Tile-serving] [mod_tile] UTFGrid support (#34)

[Dane Springmeyer]

note while the `grid_renderer` in Mapnik is available in C++ the actual encoding to json with utf8 characters is currently done in python/node.js and still needs a pure C++ api: https://github.com/mapnik/mapnik/issues/1197

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https://github.com/openstreetmap/mod_tile/issues/34#issuecomment-19779026
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