Docker 1.13 doesn't support tag --force anymore. Detect that.
-rw-r--r-- 95 COPYING
-rw-r--r-- 970 README
-rw-r--r-- 34520 agpl-3.0.txt
drwxr-xr-x - git
drwxr-xr-x - install
drwxr-xr-x - jenkins