Edit: Nevermind - I just read to the end, Piwik can auto-update to latest 1.12. Missed that when cross-reading and trying it myself while reading.
The guide and the mentioned Github repo use Piwik 1.5.1. There are several security issues with this version (perhaps many more): http://www.cvedetails.com/vulnerability-list/vendor_id-9612/...
Latest version is 1.12 - I advise against this "simple" solution to use Piwik. Perhaps there is a github repo with the latest Piwik?
The guide and the mentioned Github repo use Piwik 1.5.1. There are several security issues with this version (perhaps many more): http://www.cvedetails.com/vulnerability-list/vendor_id-9612/... Latest version is 1.12 - I advise against this "simple" solution to use Piwik. Perhaps there is a github repo with the latest Piwik?