Allow access to fork contributors on Github

This plugin is starting to smell a bit stale (with it generating warnings in PHP7 and whatnot), so I’d like to propose that we move it to community-maintained. To do that though, we’ll need access to the SVN repo.

@joraff has kindly forked this and put it on GitHub here (and has sorted out the PHP7) issue.

Are you happy to add joraff and I as contributors to the SVN repo so that we can try to keep it up to date?

Cheers