tarsnap: initial commit

Simple scripts to backup my machines to my tarsnap account and delete
backups that are older than 1 week
tmux: add script to display battery status in tmux with UTF-8 chars

Script that I use to display the battery status of my laptop in the tmux
status bar.
tmux: add script to show connected WIFI AP in tmux statusbar

Script that displays a UTF-8 character and the AP that wpa_supplicant is
connected to