PHP 5.5 compatibility

PHP 5.5 breaks compatibiliy with a number of web applications. We will collect a list of web aplications and the versions where they fully support PHP 5.5.

Application	Version	Link	Comment
serendipity	1.7.2 (partly)	http://blog.s9y.org/archives/249-Serendipity-1.7.1-and-1.7.2-released.html	nl2br plugin needs additional fix
wordpress	maybe in 3.8	http://core.trac.wordpress.org/ticket/21663	only experimental patches
mediawiki	1.21.2 works in tests	https://bugzilla.wikimedia.org/show_bug.cgi?id=49975	minor issues left, but seems to work mostly
phpmyadmin	4.0.7 works in tests	no upstream info found
roundcube	0.9.3	http://trac.roundcube.net/wiki/Changelog