Deal with multiple results for automatic geocoding.

When automatic geocoding on save for a content item results in
more than one match, choose the first one and display a message
to the user that he might want to change it.
Make sure to import exceptions we check for from the googlev3 geocoder

after switching to V3 geocoding API.
Merge pull request #3 from 4teamwork/lg-multiple-geocoding-results

Deal with multiple results for automatic geocoding.