This is a fork of MirrorDisplays by Dominic Clifton, the original was created by Fabián Cañas, details of it can be found here:
http://www.fabiancanas.com/Projects/MirrorDisplays/
Original source here:
https://code.google.com/p/mirror-displays
I forked it via github since I could not find a git repo to fork so the SVN trunk was imported.
The updated code can be found here:
https://github.com/hydra/mirror-displays
I will gladly accept pull-requests and grant people contributor access to the github repository.
The command line tool, mirror, has been updated to support up to 10 displays. It has currently only been tested with 3, and only on my hackintosh - it might not even work with just two like the original, more testing and feedback is required.
Please use github to raise issues, here's a link: