Fix geocoding in Rails 4 🎉

Responsibility for geocoding has moved from the `gmaps4rails` gem using `acts_as_taggable`, to the `geocoding` gem using `geocoded_by`. We already use this in the Address model.

app/models/enterprise.rb

@@ -17,8 +17,6 @@ class Enterprise < ActiveRecord::Base
 
   self.inheritance_column = nil
 
-  # acts_as_gmappable process_geocoding: false
-
   has_many :relationships_as_parent, class_name: 'EnterpriseRelationship',
                                      foreign_key: 'parent_id',
                                      dependent: :destroy

config/initializers/geocoder.rb

@@ -1,6 +1,7 @@
 # Google requires an API key with a billing account to use their API.
 # The key is stored in config/application.yml.
 Geocoder.configure(
+  lookup: :google,
   use_https: true,
   api_key: ENV.fetch('GOOGLE_MAPS_API_KEY', nil)
 )