Update doc
Add option to skip DB
Add option to skip DB
'-x' is a valid argument
Keep note of what to do when EPEL is down
Output dir is not a volume as we don't use it as a volume in CI
Avoid using the same variable name for different things
Merge branch 'c6-php53' into c6-php54

Conflicts:
	README.md
	run.sh
Merge branch 'c6-php54' into c6-php55

Conflicts:
	README.md
	run.sh