always draw manual obstacles
add trailer

Squashed commit of the following:

commit 39174a862d22faad07a40f08f22c60de28019724
Author: Jakob Stoeck <jakob@pokermania.de>
Date:   Fri Mar 15 15:03:01 2013 +0100

    added axis

commit 9aca037d269f7e8bc9b6fe4296de09955b92980d
Author: Jakob Stoeck <jakob@pokermania.de>
Date:   Fri Mar 15 14:58:29 2013 +0100

    add image for trailer

commit b4da8101851b8c096ae14b0b0a4208f31dfd3775
Author: Jakob Stoeck <jakob@pokermania.de>
Date:   Fri Mar 15 14:46:56 2013 +0100

    always draw manual obstacles

commit 1668b1cc68a68358f369a5d6bbcb318d21cb160f
Author: Jakob Stoeck <jakob@pokermania.de>
Date:   Wed Mar 13 21:52:30 2013 +0100

    quick hack for trailer