Add a header on Kookfiles.

lib/kook/app.rb

@@ -170,6 +170,8 @@ module Kook
 				project_file = File.join project_data.path, "Kookfile"
 					
 				File.open(project_file, "w") do |file|
+					file.puts "# This file was generated by Kook #{VERSION}"
+					file.puts "# You can get it at https://github.com/glenux/kook"
 					file.write project_data.to_hash.to_yaml
 				end
 			end