Update Nominatim Terms of Service policy link

This fixes erroring tests for ESRI lookup, which seem unrelated.
Something weird is going on. Need to investigate.

Allow esri token to be set at call time

Fix typo in README.md

Fixes link anchor in table of contents to the Error Handling section

Don't try to look up private IP address.

Fix Missing API Key for Ipdata.co Lookups

Update Railtie initializer to run before config intializers

Fixed a typo

missing a t in features in point three under 'Key features:'

"ambiguous first argument; put parentheses or a space even after `/'
operator".

Fixes #1333

Fixes #1307.

Allow Esri for_storage to be set on a per call basis

(Don't set globally.)

Fixes #1059.

by making all class methods public. Previously a call to #near or
within_bounding_box produced:

  DEPRECATION WARNING: Delegating missing full_column_name method to
  Venue. Accessibility of private/protected class methods in :scope is
  deprecated and will be removed in Rails 6.0.

I don't like turning all these methods public but at the moment I don't
see any way around it.

Make Nominatim the default lookup and map provider.

Closes #1026.

viz: add `coordinates` attribute and remove `latitude` and `longitude`.

Fixes #1258 and #1302.

Add error details for Google lookup