Fix geocoding to be a little more strict

[j-t-t]

• Mapbox is pretty good but occasionally makes some mistakes. There are two typical possibilities: if you're geocoding in a specific city and mapbox can't find the address it might give you a result from a different city. Or if it can't find the address it will default to just the center point of the city. In both those cases, fall back to using arcgis
• Google no longer allows use of geocoding api without an account with a linked payment. So removing that as an option to geocode

[codecov-commenter]

Codecov Report

Merging #317 (4a4a737) into master (f25ed8b) will decrease coverage by 0.07%. The diff coverage is 18.18%.

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@@            Coverage Diff             @@
##           master     #317      +/-   ##
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- Coverage   64.42%   64.35%   -0.07%     
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  Files          33       33              
  Lines        3314     3316       +2     
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- Hits         2135     2134       -1     
- Misses       1179     1182       +3