LuaRocks support

[smarek]

TODO, good first issue
docs: https://github.com/luarocks/luarocks/wiki/creating-a-rock

• Write and include rockspec in the repository
• check repository declared version and tags, see https://github.com/luarocks/luarocks/wiki/creating-a-rock#method-1-using-a-repository-such-as-github
• create account on luarocks.org
• publish the rock through account, see https://github.com/luarocks/luarocks/wiki/creating-a-rock#web-upload