18.03.0

Support for Private Repos and user supplied ACLs on private images
Improved handling of entrypoint, command, and working directory to be more
compliant with docker.
Shifter module support to allow user-selectable, site-definable content to
modify container setup.
Basic metrics on image usage (number of lookups)
Add direct image import capability for privileged users
API to view the current work queue and status
Minor fixes for RPM builds
Improved image unpacking for some edge cases
Dropped celery dependency to simplify installation
Updated support for slurm 17.11
Reduced help output in most error conditions (it was rather verbose)
Memory management improvements
Remove kernel module loading support
Remove support for all base filesystems except squashfs
Dropped support for systems with legacy pt_chown pty allocation
Other bug fixes

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