[RAILS] Copy files from Github rather than locally in 05-settings-files.rb

Closes elastic#541

Author: tmaier

elasticsearch-rails/lib/rails/templates/05-settings-files.rb

@@ -25,7 +25,9 @@
 
 # ----- Copy the articles_settings.json file -------------------------------------------------------
 
-copy_file File.expand_path('../articles_settings.json', __FILE__), 'config/elasticsearch/articles_settings.json'
+# copy_file File.expand_path('../articles_settings.json', __FILE__), 'config/elasticsearch/articles_settings.json'
+get 'https://raw.githubusercontent.com/elastic/elasticsearch-rails/master/elasticsearch-rails/lib/rails/templates/articles_settings.json',
+    'config/elasticsearch/articles_settings.json', force: true
 
 git add:    "config/elasticsearch/articles_settings.json"
 git commit: "-m 'Create the articles settings file'"