Squashed commit of the following:

commit 3502967052593135eb1a10f23e5fd75081683ccb
Author: Marc Bonsels <marc.bonsels@otrs.com>
Date:   Mon Jun 10 10:42:53 2013 +0200

    Implemented ivory skin with CSS3 gradients.

commit e9a555051db94654ab5436737199ab17bb25f354
Author: Marc Bonsels <marc.bonsels@otrs.com>
Date:   Mon Jun 10 09:53:06 2013 +0200

    Started rebuilting ivory skin.