adding grow command [ WIP]

[dnomadb]

In order to grow a list of tiles in the x and y dimensions.

A set of tiles:

cat data/ellada.geojson | supermercado burn 10 | mercantile shapes | fio collect | geojsonio

Grown by the default, 1:

cat data/ellada.geojson | supermercado burn 10 | supermercado grow | mercantile shapes | fio collect | geojsonio 

Grown by 10:

cat data/ellada.geojson | supermercado burn 10 | supermercado grow --distance 10 | mercantile shapes | fio collect | geojsonio

Just return the new growth:

cat data/ellada.geojson | supermercado burn 10 | supermercado grow -n | mercantile shapes | fio collect | geojsonio

Needs:

• [ ] Cleanup (namespace / opts are a little messy)
• [ ] Tests
• [ ] Documentation

[codecov-io]

Current coverage is 80.85% (diff: 35.29%)

No coverage report found for master at 4d70b7d.

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