Suggest bounding box based on address

[alesandroortiz]

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If it's feasible, the app could suggest a bounding box based on an address entered by the user, plus maybe some options such as block radius or as-the-crow-flies distance (plus maybe a box ratio for the distance option, since most blocks aren't square). The block radius option might not work everywhere, especially in areas without grids or interrupted grids.

For example, I did a bounding box for my street, plus one street on either side, plus the two avenues at the each end of my street. If the app had generated this automatically based on those parameters, I would have manually adjusted the north side a little bit, so manual adjustments after the suggestion is shown should be allowed.

Great idea and implementation! Can't wait to see how this gets even better in the future! (Might contribute if I have time too!)