[RAILS] Use read-only Git URLs in the Rails application template

Closes elastic#8

Author: AntelopeSalad

elasticsearch-rails/lib/rails/templates/01-basic.rb

@@ -130,9 +130,9 @@
 say_status  "Rubygems", "Adding Elasticsearch libraries into Gemfile...\n", :yellow
 puts        '-'*80, ''; sleep 0.75
 
-gem 'elasticsearch',       git: 'git@github.com:elasticsearch/elasticsearch-ruby.git'
-gem 'elasticsearch-model', git: 'git@github.com:elasticsearch/elasticsearch-rails.git'
-gem 'elasticsearch-rails', git: 'git@github.com:elasticsearch/elasticsearch-rails.git'
+gem 'elasticsearch',       git: 'git://github.com/elasticsearch/elasticsearch-ruby.git'
+gem 'elasticsearch-model', git: 'git://github.com/elasticsearch/elasticsearch-rails.git'
+gem 'elasticsearch-rails', git: 'git://github.com/elasticsearch/elasticsearch-rails.git'
 
 # ----- Install gems ------------------------------------------------------------------------------