Archlinux support

This adds support for Arch Linux/Arch Linux ARM. It has been around in my repo for a long time now, with a good number of users I believe, and rarely has issues.

First 3 commits are not directly related to arch, but necessary (especially the last 2).
Does Chrome really need to be pulled from AUR vs., say, grabbing the .deb or .rpm from Google and extracting what is needed?