fixed: - opengraph handling (declared it experimental)
fixed: - missing asset image cache dir with cache warmer
added: - add twig extensions: add_classes, og_variables_add, get_parameter, u, valid_extension - opengraph fragment modified: - enhanced docs
fixed: - missing variable binds
fixed: - now requires c33s/utils: dev-main instead of dev-master
added twig 3.x, dropped twig 2.x, ci
fixed missing twig dependency
initial version