Use the SATA hard drive controller for VirtualBox

> Like a real SATA controller, VirtualBox’s virtual SATA controller
> operates faster and also consumes fewer CPU resources than the virtual
> IDE controller. Also, this allows you to connect up to 30 virtual hard
> disks to one machine instead of just three, as with the VirtualBox IDE
> controller (with the DVD drive already attached).
update Arch Linux ISO

2014.5.01 ->
2014.6.01
update to latest Arch Linux ISO

2014.6.01 -> 2014.7.03

Resolves #19
Update variables to latest Arch Linux ISO image

2014.07.03 → 2014.08.01

Resolves #20