add ruby vagrantboxes

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
use include for common part

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
add more question for attirbute

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
update README to explain howto

Signed-off-by: Hiroshi Miura <miurahr@linux.com>