Introduced gitweb/static/js/cookies.js file provides functions for
setting, getting and deleting cookies.
Code taken from subsection "Cookies in JavaScript" of "Professional
JavaScript for Web Developers" by Nicholas C. Zakas and from cookie
plugin for jQuery (dual licensed under the MIT and GPL licenses).
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
