[RCU] Update 0.9.4 release

Dear Roundcube lovers!

It wouldn't be Roundcube if there wasn't a minor glitch in our stable releases every now and then :-) It so happened again in the recent 0.9.3 release where the new include_path check triggered some regex warnings on Windows systems. We apologize for this inconvenience! But we're trying hard to keep up and here's a new release which fixes that nasty bug together with some other reported issues that we considered worth being ported to the 0.9 release series.

It's considered stable (really!) and we recommend to update all productive installations of Roundcube with this version. Download it from http://roundcube.net/download, see the full changelog in our wiki: http://trac.roundcube.net/wiki/Changelog

Kind regards, Thomas