Replace HTTP by HTTPS

Replace HTTP by HTTPS

* https://www.unicode.org/ instead of http://www.unicode.org/ or
  http://unicode.org/
* https://secure.php.net/ instead of http://www.php.net/ or
  http://php.net/
* https://hhvm.com/ instead of http://hhvm.com/
* https://www.iis.net/ instead of http://www.iis.net/

Change-Id: I84d818a7e0ced5ffb9485ec89a75efb28a77c1e0