Fixed deploy of tagged images
Removed buggy supervisord, use foreman instead

Conflicts:
	README.md
Don't pass process-name to /start script. This will make foreman run all processes.
Preserve current branch
Added poc pluginhook in bash
Renamed zero-downtime to preboot and added checks
Updated README and HISTORY
Update README.md
Make CURL silent when doing checks during zero-downtime
Added data volumes plugin: persistent volumes
Update README.md
Fixed 'No such file or directory' when looking for CONTAINERS
Fixed missing .volumes directory
Fixed DEB_BRANCH in Makefile