Apologies - multi change commit by tired github newbie:
1. Simplified go_send* into single function

2. Switched to using DBUS_SESSION_BUS_ADDRESS instead of DISPLAY to fix
lack of notification on kubuntu. Method ref.
http://askubuntu.com/questions/298608/notify-send-doesnt-work-from-crontab

3. Added visual countdown via icons.

4. Security changes: 
- Added paths to commands run as root.
- Changed notification at jobs to run under kid user not root
- removed temp file before write to save symlink trash risk (e.g. tmp
filename exists as link pointing to system file, overwritten when
written)