Move generator templates to generator_templates/

Since we eager load everything in lib/ putting ERB code in .rb files
will result in syntax errors. By moving the templates to
./generator_templates we can work around this.

config/application.rb

@@ -26,6 +26,8 @@ module Gitlab
                                      #{config.root}/app/models/members
                                      #{config.root}/app/models/project_services))
 
+    config.generators.templates.push("#{config.root}/generator_templates")
+
     # Only load the plugins named here, in the order given (default is alphabetical).
     # :all can be used as a placeholder for all plugins not explicitly named.
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]