Implement register/getglobal/setglobal
Implement register/getglobal/setglobal

green-panther/rust-lua,tempbottle/rust-lua,beatgammit/rust-lua,green-panther/rust-lua,kballard/rust-lua,beatgammit/rust-lua,tempbottle/rust-lua,trevex/luajit-rs,kballard/rust-lua,trevex/luajit-rs