For the install instructions, I'm pretty sure svn doesn't have a "clone" command, nor can it checkout from github. You should use git for this.
Also, have you seen the signify plugin? This already has support for SVN and is under active development.
Hi, thanks for the comments. The 'svn clone' was a stupid search and replace error, which is now sorted thanks. No, I hadn't come across signify before, but I will most likely use that instead now.