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

[Sridhar]

I am trying to write one. You can see the code at https://github.com/sri-soham/mapnik-utf8grid-tester . I am able to generate tiles for the given x, y, z but the utf grid is coming up empty.

As I see it, the problem is with writing features to grid with grid-renderer. Relevant code being

```
mapnik::grid_renderer<mapnik::grid> ren(m_map, my_grid, 1.0, 0, 0);
std::vector<mapnik::layer> const& layers = m_map.layers();
ren.apply(layers[0], attributes);
```

in this file https://github.com/sri-soham/mapnik-utf8grid-tester/blob/master/map_tile.cpp .

I am new to mapnik and c++. Any pointers in getting this right?

Thanks

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