Add .use_local_gemfile in site folder to skip override Gemfile.

announcement.gemspec

@@ -32,6 +32,7 @@ if bundle_update_flag
   template_path = env_pwd + '/app/templates'
   all_template = Dir.glob(template_path+'/*/')
   puts 'editing files for sassc'
+  use_local_gemfile = File.exist?(env_pwd + '/.use_local_gemfile')
   new_gemfile_text = File.read(app_path+'/temp_file/Gemfile')
   old_gemfile_text = File.read(env_pwd+'/Gemfile')
   check_texts = ['@import "../../bootstrap/variables";',".response-content {\n  justify-self: auto;\n}\n"]
@@ -175,7 +176,7 @@ if bundle_update_flag
       end
     end
   end
-  if old_gemfile_text != new_gemfile_text
+  if !use_local_gemfile && old_gemfile_text != new_gemfile_text
     unicorn_rails = %x[which unicorn_rails].sub("\n",'')
     puts 'updating gemfile'
     if Dir["#{env_pwd}/config/secrets.yml"].length==0