I have also made a small video that illustrates the proces:
AvailabilityYou can download the add-on from GitHub. (click right on the Raw button and save the python file anywhere you like and then in Blender select
File->User preference, Add-ons, Install from file...Don't forget to enable the add-on as well after installing it.)
If you would like to write add-ons yourself, you might want to take a look a my books on BlenderMarket.