Reminder for OSX users not to use SUDO

Useful for those who haven't made it to the examples page yet. https://github.com/chadoh/docker/commit/dad4a998dc716e506c874ce0e792989b9df28748

Docker-DCO-1.1-Signed-off-by: No Ducks <onemannoducks@gmail.com> (github: noducks)
Fix for non-zero code: 1 error.

Was getting the following error.

ln: failed to create symbolic link `/sbin/initctl': File exists
2014/03/22 15:11:54 The command [/bin/sh -c ln -s /bin/true /sbin/initctl] returned a non-zero code: 1

the `ln` command needs to be forced.

Docker-DCO-1.1-Signed-off-by: No Ducks <onemannoducks@gmail.com> (github: noducks)
Merge branch 'master' of https://github.com/noducks/docker

Added sign-off to previous commits.