Rename arch to arch-simple builder
First version of image-based arch builder
Documented new ``arch`` builder
Fix processing mounts for shell commands
Do not clobber .vagga directory for vagga _chroot
Implement package building in archlinux builder
Fix `_run` command to mount `/tmp` and other container volumes
Implement `additional_repos` in arch builder
Enable unsafe io for ubuntu builder
Implement correct argument naming for shell commands