Minor issues with osm_to_gmns.py

[ssmith55]

@ianberg-volpe

1. Line 31, don't need to import numpy
2. I tested it on bounding box, via
   G_up = ox.graph_from_bbox(42.367,42.361,-71.081,-71.09,network_type='drive') #Kendall Square area of Cambridge, MA
   Suggest adding this line then commenting it out, as an example.
3. Output coordinates. Nodes use lat long, while Geometry uses UTM. Can we make them the same?
   Thanks.