warn user that --watch has been disabled

Author: ashmaroli

lib/jekyll/commands/serve.rb

@@ -16,6 +16,8 @@ def start_up_webrick(opts, destination)
         def jekyll_admin_monkey_patch(server)
           server.mount "/admin", Rack::Handler::WEBrick, JekyllAdmin::StaticServer
           server.mount "/_api",  Rack::Handler::WEBrick, JekyllAdmin::Server
+          Jekyll.logger.warn "Auto-regeneration:", "disabled by JekyllAdmin."
+          Jekyll.logger.warn "", "The site will regenerate only via the Admin interface."
           Jekyll.logger.info "JekyllAdmin mode:", ENV["RACK_ENV"] || "production"
         end
       end