This plugin saves the usertracking events to the Piwik service
tracker
the piwik tracked URL.
siteId
the pikiw site ID.
category
category to use to save the user events
{
"es.upv.paella.usertracking.piwikSaverPlugIn": {
"enabled": true,
"tracker": "https//tracker.server.com"
"siteId": "1"
}
}