Open the Terminal program and enter the following commands:
cd ~
git clone https://github.com/zyphlar/pinger.git
Open the Startup Applications program and click Add
Name: Pinger
Command: python ~/pinger/pinger.py
Click Save, and Close. Pinger should now start automatically in your system tray when you login next. (It just says "xx.x ms"). You can test it manually by typing python ~/pinger/pinger.py in your terminal and pressing enter.
Report bugs or feature requests at https://github.com/zyphlar/pinger/issues