Protect against singleton cloning
Merge pull request #6 from yannschepens/singleton_protect

Protect against singleton cloning
Merge https://github.com/mugoweb/mugo_varnish
Add composer json with legacy installer
Merge pull request #7 from yannschepens/composer_conf

Add composer json with legacy installer
Merge https://github.com/mugoweb/mugo_varnish