redmine: renamed script parameter start -> app:start
redmine: renamed script parameter initialize -> app:db:initialize
redmine: renamed script parameter migrate -> app:db:migrate
redmine: renamed script parameter help -> app:help
redmine: added the capability to run any installed *nix command

eg.
	docker run -i -t sameersbn/redmine top -d1
	docker run -i -t sameersbn/redmine /bin/bash -i
	...and so on.
Merge branch 'feature/cli-reborn'
redmine: fix permissions of /var/lib/mysql before initializing the mysql data directory