.config/i3/config: Add stock from archlinux.
.config/i3/config: Change modifier.
.config/i3/config: Personal adjustments.
.xinitrc: exec i3.
.config/i3/config: mod+0 always creates new workspace.

Uses a ruby script to do this (is fast enough with Ruby 2.0). Also
mod+shift+0 moves container to a new workspace.